CN111913035A - Method for calculating running power capacity of alternating-current excitation pumped storage unit - Google Patents

Method for calculating running power capacity of alternating-current excitation pumped storage unit Download PDF

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CN111913035A
CN111913035A CN202010571385.2A CN202010571385A CN111913035A CN 111913035 A CN111913035 A CN 111913035A CN 202010571385 A CN202010571385 A CN 202010571385A CN 111913035 A CN111913035 A CN 111913035A
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power
storage unit
alternating
current excitation
capacity
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钟逸铭
熊华强
万勇
潘本仁
崔斌
张妍
王冠南
桂小智
周仕豪
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/001—Measuring real or reactive component; Measuring apparent energy
    • G01R21/002—Measuring real component
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/06—Stations or aggregates of water-storage type, e.g. comprising a turbine and a pump
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/001—Measuring real or reactive component; Measuring apparent energy
    • G01R21/003—Measuring reactive component
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/343—Testing dynamo-electric machines in operation
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids

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  • General Physics & Mathematics (AREA)
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  • Control Of Eletrric Generators (AREA)

Abstract

A method for calculating the running power capacity of an alternating-current excitation pumped storage unit comprises the following steps: (1) based on an electromagnetic equivalent circuit of the alternating-current excitation motor, the power of the stator side and the rotor side is considered, and a power function of the alternating-current excitation motor connected to the power grid side under the power generation and electric working conditions is deduced. (2) And (3) deducing a mechanical power function of the pumped storage unit by taking a water head and a rotating speed as variables according to the working characteristics of the water turbine of the water pump under the working conditions of power generation and electromotion. (3) A method and a process for calculating the operating power limit of an alternating-current excitation pumped storage unit under two working conditions are provided. Compared with the prior art, the calculation method comprehensively considers the constraint conditions such as water head, flow and unit working condition, and is a practical method which can be used for peak regulation and frequency modulation optimization calculation of the power system.

Description

Method for calculating running power capacity of alternating-current excitation pumped storage unit
Technical Field
The invention relates to a method for calculating the running power capacity of an alternating-current excitation pumped storage unit, and belongs to the technical field of energy storage power stations.
Background
The pumped storage unit based on the alternating-current excitation motor can improve the operation efficiency of a water pump and a water turbine, improve the operation condition, improve the autonomous frequency modulation capability of the water pump under the working condition, improve the stability of a system through active and reactive rapid adjustment, and has unique advantages in power grid peak modulation and frequency modulation. However, at present, no calculation method for the operating power capacity considering the electromechanical characteristics and different operating conditions of the pumped storage unit exists, the active power characteristics and the reactive operating limits of the unit cannot be accurately obtained, and the accurate analysis and scheduling of the unit characteristics in the optimal scheduling of the power grid are difficult.
Therefore, a new method for calculating the operating power capacity of the ac excitation pumped-storage unit is needed.
Disclosure of Invention
The invention aims to provide a method for calculating the running power capacity of an alternating-current excitation pumped storage unit in order to accurately obtain the active power characteristic and the reactive running limit of an alternating-current excitation motor of the pumped storage unit.
The technical scheme of the invention is as follows, and the method for calculating the running power capacity of the alternating-current excitation pumped storage unit comprises the following steps:
(1) based on an electromagnetic equivalent circuit of the alternating-current excitation motor, the power of the stator side and the rotor side is considered, and a power function of the alternating-current excitation motor connected to the power grid side under the power generation and electric working conditions is deduced.
(2) And (3) deducing a mechanical power function of the pumped storage unit by taking a water head and a rotating speed as variables according to the working characteristics of the water turbine of the water pump under the working conditions of power generation and electromotion.
(3) A method and a process for calculating the operating power limit of an alternating-current excitation pumped storage unit under two working conditions are provided.
The active power of the AC excitation motor connected to the power grid side is as follows: pg＝(1-s)Ps；
The reactive power of the AC excitation motor on the side of the power grid is as follows: qg＝Qs+Qr；
Wherein, PsActive power is sent out for the stator side; qsSending reactive power to the stator side; qrThe reactive power of the grid-side converter is shown, and s is the slip ratio.
Based on an equivalent circuit of the AC excitation motor, an expression that the stator side of the AC excitation motor sends active power and reactive power can be obtained:
Figure BDA0002549406050000021
available stator side reactive power QsThe operation range is as follows:
Figure BDA0002549406050000022
reactive power operation capability Q of grid-side converterrCapacity S of primary receiverrThe reactive range of which can be expressed as:
Figure BDA0002549406050000023
based on QrLimiting pair QgMaking corrections in the range of operational capacities, on-lineSide converter reactive power QrUnder the limitation, the reactive power Q of the AC excitation motor connected to the power grid sidegThe operating range limit of (a) is as follows:
Figure BDA0002549406050000024
in the formula of UsIs the effective value of the stator voltage; xs＝Xσs+Xm，Xσs、XmRespectively a stator reactance and an excitation reactance; i isrmaxThe maximum value of the rotor current is optimized to be 120% of the rated rotor current; srIs the converter capacity.
Under the working condition of power generation, the input power of the water turbine is as follows:
PT＝0.8ωr+0.2HT-0.12；
when the water pump operates, the input power of the water turbine is as follows:
Figure BDA0002549406050000031
in the formula, ωrThe rotating speed of a rotor of the water turbine; hTRepresenting the head of the water; hpIs the lift; alpha0、ɑ1、ɑ2By lift HpAnd the relation with the water flow in the pipe is determined.
Under the power generation working condition, the active capacity function of the pumped storage unit is as follows:
Pg(HT,ωr)＝0.8ωr+0.2HT-0.12；
the reactive power operating limit is:
Figure BDA0002549406050000032
under the electric working condition, the active capacity function of the pumped storage unit is as follows:
Figure BDA0002549406050000033
the reactive power operating limit is:
Figure BDA0002549406050000034
the method has the beneficial effects that the method and the process for calculating the operating power limit of the alternating-current excitation pumped storage unit under two working conditions are provided. Compared with the prior art, the calculation method comprehensively considers the constraint conditions such as water head, flow and unit working condition, and is a practical method which can be used for peak regulation and frequency modulation optimization calculation of the power system.
Drawings
FIG. 1 is a flow chart of reactive power calculation of a pumped storage unit under a power generation working condition;
fig. 2 is a flow chart of reactive power calculation of the pumped storage unit under the electric working condition.
Detailed Description
The specific embodiments of the invention are shown in the attached drawings.
The reactive power calculation process of the pumped storage group under the power generation working condition is shown in figure 1.
Will flood the head HTRotational speed omega of water turbine rotorrSubstituting the numerical value into the active capacity function expression of the pumped storage unit: pg(HT,ωr)＝0.8ωr+0.2HT-0.12; calculating active power P of alternating current excitation motor of pumped storage unitg。
Inputting related parameters of the AC excitation motor, and calculating the reactive power limit of the AC excitation motor of the pumped storage unit:
Figure BDA0002549406050000041
wherein Q isgminThe minimum value of the reactive power of the alternating current excitation motor under the power generation working condition; qgmaxThe maximum value of the reactive power of the alternating current excitation motor under the power generation working condition.
The reactive power calculation flow of the pumped storage group under the electric working condition is shown in fig. 2.
Will flood the head HTRotational speed omega of water turbine rotorrSubstituting the numerical value into the active capacity function expression of the pumped storage unit to calculate the active power P of the alternating current excitation motorg:
Figure BDA0002549406050000042
Inputting related parameters of the AC excitation motor, and calculating the reactive power limit of the AC excitation motor of the pumped storage unit:
Figure BDA0002549406050000051
in the formula, QgminThe minimum value of the reactive power of the alternating current excitation motor under the electric working condition; qgmaxThe maximum value of the reactive power of the alternating current excitation motor under the electric working condition.

Claims (8)

1. An alternating-current excitation pumped storage unit operation power capacity calculation method is characterized by comprising the following steps:
(1) based on an electromagnetic equivalent circuit of the alternating-current excitation motor, the power of the stator side and the rotor side is considered, and a power function of the alternating-current excitation motor connected to the power grid side under the power generation and electric working conditions is deduced;
(2) the working characteristics of a water pump turbine under the working conditions of power generation and electromotion are considered, and a mechanical power function of the pumped storage unit with a water head and a rotating speed as variables is deduced;
(3) a method and a process for calculating the operating power limit of an alternating-current excitation pumped storage unit under two working conditions are provided.
2. The method for calculating the operating power capacity of the alternating-current excitation pumped-storage unit according to claim 1, wherein the active power of the alternating-current excitation motor on the side of the access power grid is as follows: pg＝(1-s)Ps(ii) a The reactive power of the AC excitation motor on the side of the power grid is as follows: qg＝Qs+Qr；
Wherein, PsActive power is sent out for the stator side; qsThe stator side reactive power; qrThe reactive power of the grid-side converter is shown, and s is the slip ratio.
3. The method for calculating the operating power capacity of the alternating-current excitation pumped-storage unit according to claim 2, wherein the method is based on QrLimiting pair QgCorrecting the operation capacity range, and converting the reactive power Q of the converter at the network siderUnder the limitation, the reactive power Q of the AC excitation motor connected to the power grid sidegThe operating range limit of (a) is as follows:
Figure FDA0002549406040000011
in the formula of UsIs the effective value of the stator voltage; xs＝Xσs+Xm，Xσs、XmRespectively a stator reactance and an excitation reactance; i isrmaxThe maximum value of the rotor current is optimized to be 120% of the rated rotor current; srIs the converter capacity.
4. The method for calculating the operating power capacity of the alternating-current excitation pumped storage unit according to claim 2, wherein the stator side reactive power QsThe operation range is as follows:
Figure FDA0002549406040000021
5. the method for calculating the operating power capacity of the alternating-current excitation pumped storage unit according to claim 2, wherein the grid-side converter has a reactive power operating capacity QrCurrent receiving converter capacity SrCan represent the reactive rangeComprises the following steps:
Figure FDA0002549406040000022
6. the method for calculating the operating power capacity of the AC excitation pumped-storage unit according to claim 1,
under the working condition of power generation, the input power of the water turbine is as follows: pT＝0.8ωr+0.2HT-0.12；
When the water pump operates, the input power of the water turbine is as follows:
Figure FDA0002549406040000023
in the formula, ωrThe rotating speed of a rotor of the water turbine; hTRepresenting the head of the water; hpIs the lift; alpha0、ɑ1、ɑ2Is determined by the relationship between the lift and the water flow in the pipe.
7. The method for calculating the operating power capacity of the AC excitation pumped-storage unit according to claim 1,
under the power generation working condition, the active capacity function of the pumped storage unit is as follows: pg(HT,ωr)＝0.8ωr+0.2HT-0.12；
The reactive power operating limit is: (ii) a
Figure FDA0002549406040000031
Under the electric pumping working condition, the active capacity function of the pumped storage unit is as follows:
Figure FDA0002549406040000032
the reactive power operating limit is:
Figure FDA0002549406040000033
8. the method for calculating the operating power capacity of the alternating-current excitation pumped storage unit according to claim 1, wherein based on the equivalent circuit of the alternating-current excitation motor, an expression of active power and reactive power emitted by a stator side of the alternating-current excitation pumped storage unit is obtained as follows:
Figure FDA0002549406040000034
in the formula of UsIs the effective value of the stator voltage; psActive power is sent out for the stator side; qsSending reactive power to the stator side; rSIs a stator resistor; xSIs the total reactance of the stator; xmIs a stator excitation reactance; i isrIs the converter current.
CN202010571385.2A 2020-06-22 2020-06-22 Method for calculating running power capacity of alternating-current excitation pumped storage unit Pending CN111913035A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115173434A (en) * 2022-06-23 2022-10-11 重庆大学 Inertia frequency modulation control method based on operation constraint of alternating-current excitation pumped storage unit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140319840A1 (en) * 2013-04-26 2014-10-30 Shun-Tsung Lu Hydroelectric system
CN104612891A (en) * 2014-11-27 2015-05-13 国家电网公司 Emergent switchover starting control method from water pumping to power generation of pump storage group

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140319840A1 (en) * 2013-04-26 2014-10-30 Shun-Tsung Lu Hydroelectric system
CN104612891A (en) * 2014-11-27 2015-05-13 国家电网公司 Emergent switchover starting control method from water pumping to power generation of pump storage group

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
李辉等: "交流励磁抽水蓄能机组运行功率能力计算", 《太阳能学报》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115173434A (en) * 2022-06-23 2022-10-11 重庆大学 Inertia frequency modulation control method based on operation constraint of alternating-current excitation pumped storage unit
CN115173434B (en) * 2022-06-23 2024-05-28 重庆大学 Inertial frequency modulation control method based on operation constraint of alternating-current excitation pumped storage unit

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Application publication date: 20201110