CN111668832B - Control method and device for pumped storage unit and power grid stability control system - Google Patents

Control method and device for pumped storage unit and power grid stability control system Download PDF

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Publication number
CN111668832B
CN111668832B CN202010460886.3A CN202010460886A CN111668832B CN 111668832 B CN111668832 B CN 111668832B CN 202010460886 A CN202010460886 A CN 202010460886A CN 111668832 B CN111668832 B CN 111668832B
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pumping
power
unit
storage unit
pumping unit
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CN111668832A (en
Inventor
王君超
任祖怡
夏尚学
祝万
白杨
徐柯
郑浩
杨博闻
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—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
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention relates to a control method and a device of a pumped storage unit and a power grid stability control system, which are applied to the technical field of power automation control, wherein the method comprises the following steps: comparing the power flow of the monitored section with a set power flow out-of-limit value, and determining the total power of the pumping and storage unit needing to be adjusted downwards; determining the actual maximum down-adjustable power of each pumping and storage unit; calculating the required down-regulation power distributed to each pumping and storage unit according to the total power of the pumping and storage unit required down-regulation and the actual maximum down-regulation power of each pumping and storage unit; determining target output of each pumping unit according to the required down-regulation power of each pumping unit and the real-time output of each pumping unit; and transmitting the target output of each pumping unit to a pumping unit control system through a pumping unit execution station so as to control each pumping unit to carry out power regulation. The method has the advantages of avoiding the trouble caused by the re-grid connection of the pumping unit and improving the economic benefit of the operation of the pumping power station.

Description

Control method and device for pumped storage unit and power grid stability control system
Technical Field
The invention relates to the technical field of power automation control, in particular to a control method and device of a pumping unit and a power grid stability control system.
Background
The pump storage unit has various excellent performances, can operate in a unit mode and a load mode, and has high output regulation rate.
At present, in the aspect of power grid stability control, when a system has a stability problem and needs to take a load shedding measure, in order to ensure the power supply reliability and continuity of other electric loads, a pumping and storage unit running in a load mode is often preferentially cut off, and in order to reduce impact on a large thermal power unit when the load shedding measure is needed, the pumping and storage unit running in a power generation mode is often preferentially cut off. Although the control mode can quickly match the unbalance amount and calm down the influence of system faults on the safe and stable operation of the power grid, the trouble of re-synchronization of the pumped storage power station can be brought by directly cutting off the pumped storage unit, and the excellent performance of quickly adjusting the output of the pumped storage unit is wasted.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a control method and device of a pumping unit and a power grid stability control system, which are beneficial to promoting the safe and stable operation of a power grid and can avoid the trouble caused by the re-synchronization of the pumping unit.
In a first aspect, the present invention provides a method for controlling a pumping unit, including the steps of:
comparing the monitored section power flow with a set power flow out-of-limit value, and determining the total power of the pumping and storage unit needing to be adjusted downwards;
determining the actual maximum down-adjustable power of each pumping and storage unit;
calculating the required down-regulation power distributed to each pumping and storage unit according to the total power of the pumping and storage unit required down-regulation and the actual maximum down-regulation power of each pumping and storage unit;
determining target output of each pumping unit according to the required down-regulation power of each pumping unit and the real-time output of each pumping unit;
and transmitting the target output of each pumping unit to a pumping unit control system through a pumping unit execution station so as to control each pumping unit to carry out power regulation.
Further, the method for determining the total power of the pumping unit to be adjusted downwards comprises the following steps:
monitoring the section tide P dm Respectively connected with the set power flow internet access out-of-limit value P mk1 Off-grid limit value P under tidal current mk2 And (3) comparison:
if P dm ＞P mk1 Judging that the section trend is out of net limit and the total power P of the pumped storage generator set needs to be reduced down-need ＝K1*(P dm -P mk1 )；
If P dm ＜P mk2 Judging the cross-limit of the network under the section trend, and reducing the total power P of the pumping and storage load unit down-need ＝K2*(P dm -P mk2 )；
If P mk2 ≤P dm ≤P mk1 Total power P of pumping storage load unit under demand down-need ＝0；
K1 is the set safety coefficient fixed value of the cross-limit of the section tidal current under the network, and K2 is the set safety coefficient fixed value of the cross-limit of the section tidal current under the network.
Further, the method for determining the actual maximum adjustable power of the storage unit comprises the following steps:
regulating the rate R according to the output of the pumped storage unit atei And the set power flow out-of-limit time T set Calculating the maximum down-regulated power P of the pumping and storage unit in the limited time max-i ＝R atei *T set ；
The maximum power P of the pumping storage unit can be adjusted downwards in a limited time max-i The maximum power P which can be adjusted downwards of the pumping and storage unit is transmitted to the pumping and storage unit on the pumping and storage unit execution station down-max-i Comparing the two power values, and taking the smaller value of the two power values as the actual maximum down-regulated power P of the pumping storage unit max-i-use 。
And further, calculating the required down-regulation power distributed to each pumping unit according to an equal proportion distribution principle.
Further, the target output P of the pumping and storage unit cmd-i The calculation is obtained according to the following formula:
P cmd-i ＝P now-i +P need-i
wherein P is cmd-i Representing the target output of the pumping and storage unit i; p now-i Representing the real-time output of the pumping and storage unit i; p need-i And indicating that the pumping unit i needs to reduce the power.
Further, when the section tidal current is out of the net, only the pumping and storage unit operating in the power generation mode is controlled to carry out power regulation; and when the cross section tidal current is out of network limit, only controlling the pumping and storage unit running in the load mode to carry out power regulation.
In a second aspect, the present invention provides an apparatus for controlling an accumulator unit, the apparatus comprising:
a first determination module: the system is used for comparing the power flow of the monitored section with a set power flow out-of-limit value and determining the total power of the pumping and storage unit needing to be adjusted downwards;
a second determination module: the method comprises the steps of determining the actual maximum down-regulated power of each pumping and storage unit;
a calculation module: the system comprises a pump storage unit, a power control unit and a power control unit, wherein the pump storage unit is used for storing the power required to be adjusted;
a third determination module: the system comprises a plurality of pumping units, a plurality of storage units and a controller, wherein the pumping units are used for regulating the power required by each pumping unit and the real-time output of each pumping unit;
a sending module: and the system is used for issuing the target output of each pumping unit to the pumping unit control system through the pumping unit execution station so as to control each pumping unit to carry out power regulation.
In a third aspect, the present invention provides a control apparatus for a pumped storage unit, including a processor and a storage medium; the storage medium is used for storing instructions;
the processor is configured to operate according to the instructions to perform steps in a method of controlling a storage battery unit.
In a fourth aspect, the invention provides a computer readable storage medium, which when executed by a processor implements the steps of any of the methods described above.
In a fifth aspect, the invention provides a power grid stability control system, which comprises a pumping unit control system, a pumping unit execution station and a regional master station, wherein the pumping unit control system forwards real-time operation data of a pumping unit to the regional master station through the pumping unit execution station; the regional master station can execute the steps of any one of the methods according to the acquired real-time operation data of the storage unit.
Compared with the prior art, the invention has the following beneficial effects:
1. by utilizing the capacity of the pumping and storage unit for quickly adjusting output, the stability of the power grid is improved on the premise of no shutdown, the traditional control means of directly cutting off the pumping and storage unit to improve the stability of the power grid is replaced, the trouble caused by re-synchronization of the pumping and storage unit is avoided, and the economic benefit of operation of a pumping and storage power station is improved;
2. the pumping storage unit is classified according to the power generation/load mode, and differential control is performed when the section monitored by the regional master station is out of network and out of network, so that the effect of the pumping storage unit on bidirectional support of a power grid is fully utilized, and the power shortage of a power supply or a load is effectively made up.
3. The adjustment quantity of each pumping storage unit is distributed in equal proportion, the matching precision of the unbalance quantity of the power grid can be improved, the faults of unit tripping, network disconnection and the like possibly caused by overlarge adjustment capacity of a certain unit are avoided, and the safe and stable operation of the unit is facilitated.
Drawings
Fig. 1 is a flowchart of a control method for an accumulator unit according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for distributing the output of the storage unit from the storage unit execution station according to the embodiment of the present invention;
fig. 3 is a block diagram of a structure of a power grid stability control system according to an embodiment of the present invention.
Detailed Description
For some line thermal stability and power off-limit problems, the pumping storage unit is allowed to operate for a certain time near a limit value, so that the output capacity of the pumping storage unit is utilized, the output of each pumping storage unit is used as a continuous control object without directly cutting off the unit through a communication network formed by a pumping storage unit execution station and a pumping storage unit control system, the matching precision can be greatly improved, the safe and stable operation of a pumping storage power station power grid is facilitated, the trouble of re-synchronization of the pumping storage unit is avoided, and the economic operation benefit of the pumping storage power station is improved. Based on the technical concept, the embodiment of the invention provides a control method and device of a pumping unit, and a power grid stability control system. The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The first embodiment is as follows:
as shown in fig. 1 and 2, a method for controlling a pumping unit includes the following steps:
step 1: comparing the power flow of the monitored section with a set power flow out-of-limit value to determine the total power P of the pumping and storage unit required to be adjusted downwards down-need The method comprises the following steps:
monitoring the section tide P dm Respectively connected with the set power flow internet access out-of-limit value P mk1 Off-grid limit value P under tidal current mk2 And (3) comparison:
if P dm ＞P mk1 Judging that the section trend is out of net limit and the total power P of the pumped storage generator set needs to be reduced down-need ＝K1*(P dm -P mk1 )；
If P dm ＜P mk2 Judging the cross-limit of the network under the section trend, and reducing the total power P of the pumping and storage load unit down-need ＝K2*(P dm -P mk2 )；
If P mk2 ≤P dm ≤P mk1 Total power P of pumping storage load unit under demand down-need ＝0；
K1 is the set safety coefficient fixed value of the cross-limit of the section tidal current under the network, and K2 is the set safety coefficient fixed value of the cross-limit of the section tidal current under the network. K1, K2, P mk1 And P mk2 Is a numerical value which is preset manually and belongs to a known state.
And 2, step: determining the actual maximum down-adjustable power of each pumping unit, comprising the following steps:
s201: regulating the rate R according to the output of the pumped storage unit atei And the set power flow out-of-limit time T set Calculating the maximum down-regulated power P of the pumping and storage unit in the limited time max-i ＝R atei *T set (ii) a Wherein R is atei Representing the rate of regulation, T, of the pumping unit set Representing the limit time of the out-of-limit work allowed by the pumping unit;
s202: the maximum power P of the pumping storage unit can be adjusted downwards in a limited time max-i The maximum power P which can be adjusted downwards of the pumping and storage unit is transmitted to the pumping and storage unit on the pumping and storage unit execution station down-max-i And (3) comparison: if P max-i ＜P down-max-i Then the actual maximum down-regulated power P of the pumping storage unit is made max-i-use ＝P max-i (ii) a Otherwise, the actual maximum down-regulated power P of the pumping storage unit is enabled max-i-use ＝P down-max-i 。
Step 3, the total power P of the pumping and storage unit is adjusted down according to the requirement down-need And the actual maximum down-regulated power P of each pumping storage unit max-i-use Calculating the required reduced power P distributed to each pumping unit need-i 。
Firstly, judging whether the section tide is out of network limit: if the section trend is out of limit on the internet, the total power P of the pumping and storage unit is required to be reduced according to the equal proportion distribution principle down-need Distributing the power P required to be reduced to each pumping storage unit in each power generation unit need-i ＝P down-need *(P max-i-use /∑1P _maxi_use )，∑1P _maxi_use A sum representing the maximum down-regulation of all the storage units operating in the generating mode;
if the cross section trend is off-line, the total power P of the pumping and storage unit is required to be adjusted downwards according to the equal proportion distribution principle down-need Distributing in each load unit, the down-regulation quantity distributed to each unit is P _needi ＝P down_need *(P _maxi_use /∑2P _maxi_use )，∑2P _maxi_use A summation value representing the maximum amount of turndown of all the banks operating in load mode.
It is to be noted thatSection tidal current P dm When the internet is out of limit, only the pumping and storage unit running in the power generation mode is controlled, and the pumping and storage unit running in the load mode is not controlled; section tidal current P dm And when the network is off, only the pumping and storage unit running in the load mode is controlled, and the pumping and storage unit running in the power generation mode is not controlled. Wherein the maximum down-regulated power P of the pumping unit is sent by the pumping unit execution station down-max-i The specific process is shown in fig. 2, if a certain unit is not operated in the power generation mode or the load mode, the program determines that the pumping unit is in an invalid mode, and does not bring the pumping unit into the control range any more, and simultaneously sets all the real-time output and the maximum down-adjustable amount information to zero.
Step 4, determining the target output P of each pumping unit according to the required reduced power of each pumping unit and the real-time output of each pumping unit cmd-i And sending the target output of each pumping unit to a pumping unit control system through a pumping unit execution station so as to control each pumping unit to carry out power regulation.
Target output P of pumping and storage unit cmd-i The calculation is obtained according to the following formula:
P cmd-i ＝P now-i +P need-i
wherein P is cmd-i Representing the target output of the pumping unit i; p now-i Representing the real-time output of the pumping and storage unit i; p need-i And indicating that the pumping unit i needs to reduce the power.
When each pumping unit reaches the set final output value P cmd-I And stopping adjusting the pumping and storage unit.
According to the control method of the pumping unit, provided by the embodiment of the invention, the stability of the power grid is adjusted on the premise of no shutdown by utilizing the capability of the pumping unit for quickly adjusting the output, the traditional control means of directly cutting off the pumping unit to adjust the stability of the power grid is replaced, the trouble caused by re-synchronization of the pumping unit is avoided, and the economic benefit of the operation of a pumping power station is improved; the pumping storage unit is classified according to the power generation/load mode, and differential control is performed when the section monitored by the regional master station is out of network and out of network, so that the bidirectional support effect of the pumping storage unit on the power grid is fully utilized, and the power shortage of a power supply or a load is effectively made up; the adjustment quantity of each pumping storage unit is distributed in equal proportion, the matching precision of the unbalance quantity of the power grid can be improved, the faults of unit tripping, network disconnection and the like possibly caused by overlarge adjustment capacity of a certain unit are avoided, and the safe and stable operation of the unit is facilitated.
The second embodiment:
the embodiment of the invention provides a control device of a pumped storage unit in power grid stability control, which can be used for executing the method in the first embodiment, and the control device comprises:
a first determination module: the system is used for comparing the monitored section power flow with a set power flow out-of-limit value and determining the total power of the pumping and storage unit needing to be adjusted downwards;
a second determination module: the method comprises the steps of determining the actual maximum down-regulated power of each pumping and storage unit;
a calculation module: the system comprises a pump storage unit, a power control unit and a power control unit, wherein the pump storage unit is used for storing the power required to be adjusted;
a third determination module: the system is used for determining the target output of each pumping unit according to the required down-regulation power of each pumping unit and the real-time output of each pumping unit;
a sending module: and the target output of each pumping unit is sent to the pumping unit control system through the pumping unit execution station so as to control each pumping unit to carry out power regulation.
Example three:
the embodiment of the invention provides a control device of a pumping unit in power grid stability control, which comprises a processor and a storage medium, wherein the processor is used for processing a plurality of data packets; a storage medium to store instructions; the processor is configured to operate in accordance with the instructions to perform the steps of the method of embodiment one.
Example four:
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 the steps of the method according to the first embodiment:
example five:
as shown in fig. 3, an embodiment of the present invention provides a power grid stability control system, which includes a storage unit control system, a storage unit execution station, and a regional master station, where the storage unit control system, the storage unit execution station, and the regional master station transmit information to each other through a communication network. The pumping unit control system forwards real-time operation data of the pumping unit to the regional master station through a pumping unit execution station; the regional master station can execute the steps of the method of the first embodiment according to the acquired real-time operation data of the storage unit.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (7)

1. A control method for a pumping unit, the method comprising the steps of:
comparing the monitored section power flow with a set power flow out-of-limit value, and determining the total power of the pumping and storage unit needing to be adjusted downwards;
determining the actual maximum down-adjustable power of each pumping and storage unit;
calculating the required down-regulation power distributed to each pumping and storage unit according to the total power of the pumping and storage unit required down-regulation and the actual maximum down-regulation power of each pumping and storage unit;
determining target output of each pumping unit according to the required down-regulation power of each pumping unit and the real-time output of each pumping unit;
the target output of each pumping unit is sent to a pumping unit control system through a pumping unit execution station to control each pumping unit to carry out power regulation;
the method for determining the total power of the pumping unit needing to be adjusted downwards comprises the following steps:
monitoring the section tide P dm Respectively accessing the network with the set tide out-of-limit value P mk1 Off-grid limit value P under tidal current mk2 And (3) comparison:
if P dm ＞P mk1 Judging that the section trend is out of net limit and the total power P of the pumped storage generator set needs to be reduced down-need ＝K1*(P dm -P mk1 )；
If P dm ＜P mk2 Judging the cross-limit of the network under the section trend, and reducing the total power P of the pumping and storage load unit down-need ＝K2*(P dm -P mk2 )；
If P mk2 ≤P dm ≤P mk1 The total power P of the pumping and storage load unit needs to be adjusted downwards down-need ＝0；
K1 is a set safety coefficient fixed value of the off-limit of the section tidal current on the network, and K2 is a set safety coefficient fixed value of the off-limit of the section tidal current under the network;
when the section tidal current is out of the net limit, only controlling the pumping and storing unit operating in the power generation mode to carry out power regulation; when the cross section tidal current is out of network, only controlling the pumping unit operating in the load mode to carry out power regulation;
the method for determining the actual maximum adjustable power of the pumping unit comprises the following steps:
regulating the rate R according to the output of the pumped storage unit atei And the set power flow threshold crossing time T set Calculating the maximum down-adjustable power P of the pumping and storage unit in the limited time max-i ＝R atei *T set ；
The maximum power P of the pumping storage unit can be adjusted downwards in a limited time max-i Sending the maximum down-regulated power P of the pumping and storage unit to the pumping and storage unit execution station down-max-i Comparing the two power values, and taking the smaller value of the two power values as the actual maximum down-regulated power P of the pumping storage unit max-i-use 。
2. A method of controlling an accumulator unit as claimed in claim 1 wherein the power demand reduction allocated to each unit is calculated according to an equal proportion allocation principle.
3. The method of claim 1,characterized in that the target output P of the pumping unit is P cmd-i The acquisition is calculated according to the following formula:
P cmd-i ＝P now-i +P need-i
wherein P is cmd-i Representing the target output of the pumping and storage unit i; p now-i Representing the real-time output of the pumping and storage unit i; p is need-i And indicating that the pumping unit i needs to reduce the power.
4. A control apparatus for a pump assembly, the apparatus comprising:
a first determination module: the system is used for comparing the power flow of the monitored section with a set power flow out-of-limit value and determining the total power of the pumping and storage unit needing to be adjusted downwards;
a second determination module: the method comprises the steps of determining the actual maximum down-regulated power of each pumping and storage unit;
a calculation module: the system comprises a pump storage unit, a power control unit and a power control unit, wherein the pump storage unit is used for storing the power required to be adjusted;
a third determination module: the system comprises a plurality of pumping units, a plurality of storage units and a controller, wherein the pumping units are used for regulating the power required by each pumping unit and the real-time output of each pumping unit;
a sending module: the system is used for sending the target output of each pumping unit to a pumping unit control system through a pumping unit execution station so as to control each pumping unit to carry out power regulation;
the method for determining the total power of the pumping unit needing to be adjusted downwards comprises the following steps:
monitoring the section tide P dm Respectively accessing the network with the set tide out-of-limit value P mk1 Off-grid limit value P under tidal current mk2 And (3) comparison:
if P dm ＞P mk1 Judging that the section trend is out of net limit and the total power P of the pumped storage generator set needs to be reduced down-need ＝K1*(P dm -P mk1 )；
If P dm ＜P mk2 Judging the cross-limit of the network under the section trend, and reducing the total power of the pumping storage load unitP down-need ＝K2*(P dm -P mk2 )；
If P mk2 ≤P dm ≤P mk1 Total power P of pumping storage load unit under demand down-need ＝0；
K1 is a set safety coefficient fixed value of the cross-limit on the section tidal current, and K2 is a set safety coefficient fixed value of the cross-limit on the section tidal current;
when the section tidal current is out of the net limit, only controlling the pumping and storing unit operating in the power generation mode to carry out power regulation; when the cross section tidal current is out of network, only controlling the pumping unit operating in the load mode to carry out power regulation;
the method for determining the actual maximum adjustable power of the pumping unit comprises the following steps:
regulating the rate R according to the output of the pumped storage unit atei And the set power flow out-of-limit time T set Calculating the maximum down-adjustable power P of the pumping and storage unit in the limited time max-i ＝R atei *T set ；
The maximum power P of the pumping and storage unit can be adjusted downwards in a limited time max-i Sending the maximum down-regulated power P of the pumping and storage unit to the pumping and storage unit execution station down-max-i Comparing, and taking the smaller value as the actual maximum down-regulated power P of the pumping storage unit max-i-use 。
5. A control device of a pumping unit is characterized by comprising a processor and a storage medium;
the storage medium is to store instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 3.
6. Computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, is adapted to carry out the steps of the method of any of claims 1 to 3.
7. A power grid stability control system is characterized by comprising a pumping unit control system, a pumping unit execution station and a regional main station, wherein the pumping unit control system forwards real-time operation data of a pumping unit to the regional main station through the pumping unit execution station; the regional master station can execute the steps of the method according to any one of claims 1 to 3 according to the acquired real-time operation data of the storage unit.
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