CN110535158A - A kind of the power-angle stability method for improving and system of alternating current-direct current interconnected electric power system - Google Patents
A kind of the power-angle stability method for improving and system of alternating current-direct current interconnected electric power system Download PDFInfo
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- CN110535158A CN110535158A CN201910668024.7A CN201910668024A CN110535158A CN 110535158 A CN110535158 A CN 110535158A CN 201910668024 A CN201910668024 A CN 201910668024A CN 110535158 A CN110535158 A CN 110535158A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
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Abstract
The present invention relates to a kind of power-angle stability method for improving of alternating current-direct current interconnected electric power system and systems, which comprises the generator rotor angle of generator is poor in acquisition alternating current-direct current interconnected electric power system；The charge/discharge value and power reference of the energy-storage system is determined according to the generator rotor angle difference；The charge/discharge power of the energy-storage system is determined according to the charge/discharge value and power reference；Charge/discharge power control energy-storage system based on the energy-storage system carries out charge/discharge.Technical solution provided by the invention is directed to the angle stability characteristic of alternating current-direct current interconnected electric power system, energy storage technology is analyzed quickly to dissolve the imbalance power of alternating current-direct current interconnected electric power system and promote the feasibility of alternating current-direct current interconnected electric power system power-angle stability, and the energy storage controller that can be improved power-angle stability is designed, it finally realizes the alternating current-direct current interconnected electric power system power-angle stability based on energy storage technology and is promoted.
Description
Technical field
The invention belongs to Power system stability fields, and in particular to a kind of generator rotor angle of alternating current-direct current interconnected electric power system is steady
Qualitative method for improving and system.
Background technique
Since there are the advantage of economy, fault in ac transmission system isolation etc., D.C. high voltage transmission becomes transregional electricity
The important technical of power resource optimization strategy.However, compared to conventional AC interconnected electric power system, AC/DC interconnected system
Angle stability characteristic is more complicated, and research runs interconnected network for the angle stability control technology of AC/DC interconnected system
Safety and power supply reliability have very positive meaning.
Large disturbances generator rotor angle can be divided by disturbance size and its difference of corresponding analysis method, the power-angle stability of electric system
Stability and microvariations power-angle stability.For large disturbances power-angle stability, the prior art is in further investigation alternating current-direct current interconnection electricity
On the basis of Force system generator rotor angle instability Mechanism, formulated by technical methods such as transient energy function or extended equal area criterions anti-
Only interacted system generator rotor angle unstability cuts machine, cutting load emergency control policy.For microvariations power-angle stability, the prior art is concentrated
In the mathematical model of building alternating current-direct current interconnected electric power system small disturbed stability, eigenvalue Method or frequency domain analysis etc. are utilized
Stability analysis is carried out, Survey of Flexible AC Transmission System Technology and the VSC such as power system stabilizer, SVC and TCSC are further utilized
Stablize with New DC transmission technologies such as MMC to improve System Small Disturbance.
In the prior art, to cut machine, cutting load will necessarily be to hair as the large disturbances power-angle stability control method of means
Electric side and load side cause economic loss；Survey of Flexible AC Transmission System Technology and New DC transmission skill upgrading interconnected network power
Transmission limit, but adaptability is lacked for the complicated low-frequency oscillation problem of interconnected network.Generally speaking, in the prior art to disturb greatly
Dynamic, microvariations power-angle stability Promotion Strategy often has that model is excessively complicated, is difficult to the problems such as coordinated control parameter, therefore sends out
Open up a kind of simple, high compatibility, the angle stability control technology of fast response time promoted power-angle stability very it is necessary to.
Summary of the invention
In view of the deficiencies of the prior art, the object of the present invention is to provide a kind of angle stabilities of alternating current-direct current interconnected electric power system
Property method for improving and system analyze energy storage technology and quickly dissolve for the angle stability characteristic of alternating current-direct current interconnected electric power system
The imbalance power of alternating current-direct current interconnected electric power system and the feasibility for promoting alternating current-direct current interconnected electric power system power-angle stability, and set
Meter can be improved the energy storage controller of power-angle stability, finally realize the alternating current-direct current interconnected electric power system function based on energy storage technology
Angle stability is promoted.
The purpose of the present invention is adopt the following technical solutions realization:
A kind of power-angle stability method for improving of alternating current-direct current interconnected electric power system, the alternating current-direct current interconnected electric power system are sent
End power grid is connected to energy-storage system, it is improved in that the described method includes:
The generator rotor angle for acquiring generator in alternating current-direct current interconnected electric power system is poor；
The charge/discharge value and power reference of the energy-storage system is determined according to the generator rotor angle difference；
The charge/discharge power of the energy-storage system is determined according to the charge/discharge value and power reference；
Charge/discharge power control energy-storage system based on the energy-storage system carries out charge/discharge.
Preferably, the charge/discharge value and power reference that the energy-storage system is determined according to the generator rotor angle difference, comprising:
The charge/discharge value and power reference of the energy-storage system is determined as the following formula
In formula, Δ ω is that the generator rotor angle of generator in alternating current-direct current interconnected electric power system is poor, TW、WithIt is outer ring controller
Proportion integral modulus, KPFor gain coefficient, s is complex variable.
Further, the charge/discharge value and power reference of the energy-storage systemIt needs to meet:Its
In,For the lower limit of the charge/discharge value and power reference of the energy-storage system,For the discharge/charge electric work of the energy-storage system
The upper limit of rate reference value.
Preferably, the charge/discharge power that the energy-storage system is determined according to the charge/discharge value and power reference, packet
It includes:
The charge/discharge power P of the energy-storage system is determined as the following formulaES:
In formula,For the charge/discharge value and power reference of the energy-storage system, PESFor the discharge/charge electric work of the energy-storage system
Rate, TPFor the inertia time constant of inner loop control, s is complex variable.
Further, the charge/discharge power P of the energy-storage systemESIt needs to meet:Wherein,For
The lower limit of the charge/discharge value and power reference of the energy-storage system,For the charge/discharge value and power reference of the energy-storage system
The upper limit.
A kind of power-angle stability lifting system of alternating current-direct current interconnected electric power system, the alternating current-direct current interconnected electric power system are sent
End power grid is connected to energy-storage system, it is improved in that the power-angle stability lifting system includes:
Acquisition unit, it is poor specifically for the generator rotor angle of generator in acquisition alternating current-direct current interconnected electric power system；
First determination unit, for determining the charge/discharge value and power reference of the energy-storage system according to the generator rotor angle difference；
Second determination unit, for determining the discharge/charge electric work of the energy-storage system according to the charge/discharge value and power reference
Rate；
Control unit carries out charge/discharge for the charge/discharge power control energy-storage system based on the energy-storage system.
Preferably, first determination unit is specifically used for:
The charge/discharge value and power reference of the energy-storage system is determined as the following formula
In formula, Δ ω is that the generator rotor angle of generator in alternating current-direct current interconnected electric power system is poor, TW、WithIt is outer ring controller
Proportion integral modulus, KPFor gain coefficient, s is complex variable.
Further, the charge/discharge value and power reference of the energy-storage systemIt needs to meet:Its
In,For the lower limit of the charge/discharge value and power reference of the energy-storage system,For the discharge/charge electric work of the energy-storage system
The upper limit of rate reference value.
Preferably, second determination unit is specifically used for:
The charge/discharge power P of the energy-storage system is determined as the following formulaES:
In formula,For the charge/discharge value and power reference of the energy-storage system, PESFor the discharge/charge electric work of the energy-storage system
Rate, TPFor the inertia time constant of inner loop control, s is complex variable.
Further, the charge/discharge power P of the energy-storage systemESIt needs to meet:Wherein,For
The lower limit of the charge/discharge value and power reference of the energy-storage system,For the charge/discharge value and power reference of the energy-storage system
The upper limit.
Compared with the immediate prior art, the device have the advantages that being embodied in:
The present invention provides a kind of simple, high compatibility, the power-angle stability method for improving of fast response time, energy-storage systems
The dynamic characteristic for capableing of quick charge/discharge can be used for adjusting the imbalance power when oscillation of alternating current-direct current interconnected electric power system, pass through
It determines the charge/discharge power of energy-storage system, and the charge/discharge power of energy-storage system is constrained, energy-storage system can be controlled
Charge/discharge is carried out, to realize the promotion of the power-angle stability of alternating current-direct current interconnected electric power system.
Detailed description of the invention
Fig. 1 is a kind of process of the power-angle stability method for improving of alternating current-direct current interconnected electric power system in the embodiment of the present invention
Figure；
Fig. 2 is outer ring controlling unit figure in the embodiment of the present invention；
Fig. 3 is inner loop control link figure in the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of four machine two-region systems in the embodiment of the present invention containing energy-storage system；
Fig. 5 be in the embodiment of the present invention under microvariations control energy-storage system carry out charge/discharge before and after system realm between
Revolving speed dygoram；
Fig. 6 is to control the energy-storage system that energy-storage system carries out before and after charge/discharge in the embodiment of the present invention under microvariations to export
Active power curves figure；
Fig. 7 is the oscillation of power curve controlled under microvariations before and after energy-storage system progress charge/discharge in the embodiment of the present invention
Figure；
Fig. 8 is the oscillation of power curve controlled under large disturbances before and after energy-storage system progress charge/discharge in the embodiment of the present invention
Figure；
Fig. 9 is that a kind of structure of the power-angle stability lifting system of alternating current-direct current interconnected electric power system is shown in the embodiment of the present invention
It is intended to.
Specific embodiment
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention provides a kind of power-angle stability method for improving of alternating current-direct current interconnected electric power system, as shown in Figure 1, the side
Method includes:
The generator rotor angle that step 101. acquires generator in alternating current-direct current interconnected electric power system is poor；
Step 102. determines the charge/discharge value and power reference of the energy-storage system according to the generator rotor angle difference；
Step 103. determines the charge/discharge power of the energy-storage system according to the charge/discharge value and power reference；
Step 104. carries out charge/discharge based on the charge/discharge power control energy-storage system of the energy-storage system.
Specifically, after the generator rotor angle difference of generator in collected alternating current-direct current interconnected electric power system is input to energy-storage system,
The step 102 includes:
The charge/discharge value and power reference of the energy-storage system is determined as the following formula
In formula, Δ ω is that the generator rotor angle of generator in alternating current-direct current interconnected electric power system is poor, TW、WithIt is outer ring controller
Proportion integral modulus, KPFor gain coefficient, s is complex variable.
Wherein, the charge/discharge value and power reference of the energy-storage systemIt needs to meet:Wherein,For the lower limit of the charge/discharge value and power reference of the energy-storage system,For the charge/discharge power of the energy-storage system
The upper limit of reference value.
Specifically, after determining the charge/discharge value and power reference of the energy-storage system, the step 103 includes:
The charge/discharge power P of the energy-storage system is determined as the following formulaES:
In formula,For the charge/discharge value and power reference of the energy-storage system, PESFor the discharge/charge electric work of the energy-storage system
Rate, TPFor the inertia time constant of inner loop control, s is complex variable.
Wherein, the charge/discharge power P of the energy-storage systemESIt needs to meet:Wherein,It is described
The lower limit of the charge/discharge value and power reference of energy-storage system,For the energy-storage system charge/discharge value and power reference it is upper
Limit.
A kind of cardinal principle of the power-angle stability method for improving foundation of alternating current-direct current interconnected electric power system provided by the invention
Are as follows: energy-storage system can be by providing damping to alternating current-direct current interconnected electric power system, to improve alternating current-direct current interconnecting electric power system
The power-angle stability of system；
The proof procedure of the principle includes:
Step 1: constructing the perturbation analysis mould of the corresponding equivalent one machine infinity bus system of the alternating current-direct current interconnected electric power system
Type specifically includes:
The alternating current-direct current interconnected electric power system is equivalent at equivalent one machine infinity bus system, it determines as the following formula described equivalent single
The equivalent dynamic model of machine Infinite bus system:
In formula, t is time, ωBFor the specified rotor velocity of system, PacFor alternating current interconnection transimission power, PdcIt is straight
Flow tie-line power transmission, the expression formula of other parameters are as follows:
δSR=δS-δR
ωSR=ωS-ωR
Wherein, δSFor the equivalent unit generator rotor angle of the sending end power grid of the alternating current-direct current interconnected electric power system, δRFor the alternating current-direct current
The equivalent unit generator rotor angle of the receiving end power grid of interconnected electric power system, ωSAnd ωRThe respectively described sending end power grid and receiving end power grid etc.
Check-in group rotor angular speed, PmSAnd PmRThe equivalent unit of the respectively described sending end power grid and receiving end power grid inputs mechanical output, PLS
And PLRThe duty value of respectively described sending end power grid and receiving end power grid, TjSAnd TjRThe respectively described sending end power grid and receiving end electricity
The equivalent unit set inertia time constant of net；
The equivalent dynamic model of the equivalent one machine infinity bus system is subjected to linearization process, obtains the equivalent single machine
The perturbation analysis model of Infinite bus system:
In formula, PacmaxFor the maximum value of the alternating current interconnection transimission power.
Step 2: ratio control energy-storage system is accessed the sending end power grid of the alternating current-direct current interconnected electric power system, and construct
The improvement perturbation analysis model of corresponding equivalence one machine infinity bus system, specifically includes:
The alternating current-direct current interconnected electric power system of the ratio of access control energy-storage system is equivalent at equivalent one machine infinity bus system, it presses
Following formula determines the improvement equivalent dynamic model of the equivalent one machine infinity bus system:
In formula, PESSThe active power that energy-storage system is injected into the sending end power grid, P are controlled for the ratioESS=-K Δ
ω, K are proportionality coefficient and K > 0, and Δ ω is that the generator rotor angle of generator in alternating current-direct current interconnected electric power system is poor；
The improvement equivalent dynamic model is subjected to linearization process, obtains the improvement perturbation analysis model:
Step 3: the perturbation analysis model and improvement perturbation analysis model are organized into homogeneous differential equation respectively, and
Characteristic root solution is carried out, proves that energy-storage system can be improved alternating current-direct current interconnected electric power system generator rotor angle according to obtained characteristic root is solved
Stability specifically includes:
The homogeneous differential equation that the perturbation analysis model is organized into is determined as the following formula:
Characteristic root solution, obtained characteristic root λ are carried out to the homogeneous differential equation that the perturbation analysis model is organized into1
Are as follows:
The homogeneous differential equation that the improvement perturbation analysis model is organized into is determined as the following formula:
The homogeneous differential equation being organized into the improvement perturbation analysis model carries out characteristic root solution, obtained characteristic root
λ1,2Are as follows:
By characteristic root λ1With characteristic root λ1,2It compares: if not considering direct current system component, characteristic root λ1Show system by
Undamped oscillation state will be in after disturbing, the alternating current-direct current interconnected electric power system power-angle stability will decline；And in characteristic root λ1,2
In, there is the component of influence oscillation mode i.e.The component for influencing oscillation mode is capable of providing damping,
To improve the alternating current-direct current interconnected electric power system power-angle stability；
The ratio control energy-storage system can promote the alternating current-direct current interconnected electric power system power-angle stability, then
The energy-storage system of other forms can also promote the alternating current-direct current interconnected electric power system power-angle stability.
Technical solution provided by the invention is by analysis alternating current-direct current interconnected electric power system power-angle stability principle, by alternating current-direct current
Interconnected electric power system is reduced to equivalent one machine infinity bus system, and according to the perturbation analysis model of equivalent one machine infinity bus system,
Energy storage power component is introduced in the differential equation of rotor velocity, and demonstrate energy-storage system by analysis characteristic root to mention
Rise the power-angle stability of alternating current-direct current interconnected electric power system.
In another embodiment of the invention, with four machine two-region systems of the synchronous interconnection of typical alternating current-direct current as shown in Figure 2
For, the system include a DC contact route, four synchronous generators, five transformers, a set of energy-storage system (ESS) and
Two load points (PL7, PL9), interbus, that is, Bus7 access of the energy-storage system ESS from sending end Grid 1.
It include outer loop control link and inner loop control link in energy-storage system ESS, outer loop control link is true according to generator rotor angle difference
The charge/discharge value and power reference of energy-storage system is determined, as shown in figure 3, outer loop control link is realized by PID controller；It is interior
Ring controlling unit determines the charge/discharge power of energy-storage system according to charge/discharge value and power reference, as shown in figure 4, inner loop control ring
Section is realized by first order inertial loop.
Under normal operating conditions, it is run simultaneously between each generator, electric system stable operation is existed
50Hz frequency；Fault energy can be generated after four machine two-region systems receive various disturbances, the generator rotor angle difference Δ ω of generator is defeated at this time
Enter into energy-storage system, energy-storage system carries out charge/discharge to export charge/discharge power, so that the discharge/charge electric work of energy-storage system
The fault energy that rate and four machine two-region systems generate offsets, and four machine two-region systems restore steady again after fault energy disappearance
It is fixed, realize the promotion of power-angle stability.
In PSCAD, four machine two-region systems of the synchronous interconnection of typical alternating current-direct current as shown in Figure 2 are emulated, wherein
Simulating scenes setting are as follows: when not controlling energy-storage system progress charge/discharge, sending end transmission power is 600MW, and wherein direct current conveys function
Rate is 200MW, and exchange transmission power is 200MW.Select energy-storage system output power tie-line power transmission 10% with
Interior, the output bound of energy storage active power is set as ± 40MW.
When small interference is set as 2s, the excitation voltage reference value U of sending end generator G2ref3% step increments occur, therefore
Hinder and eliminate disturbance after continuing 0.1s, the dominant eigenvalues between region 1 and region 2 vibrate, when emulation a length of 10s.Pass through
Control parameter is determined after parameter optimization, control energy-storage system carries out rotational speed difference such as Fig. 5 institute between the system realm before and after charge/discharge
Show, control energy-storage system carries out the active power curves of the energy-storage system output before and after charge/discharge as shown in fig. 6, control energy storage
The oscillation of power curve that system carries out before and after charge/discharge is as shown in Figure 7.
As shown in fig. 7, in microvariations, low-frequency oscillation occurs for system before control energy-storage system charge/discharge,
Alternating current interconnection power is vibrated after 10s and is not calmed down there are the power swing that oscillation amplitude is about 30MW, and dc power also occurs
Apparent power swing；After controlling energy-storage system charge/discharge, the effect of energy-storage system is mainly reflected in the 3-4 after disturbance occurs
In a period, and power compensation ability is stronger within the period, and tieline oscillation is significantly suppressed, this is by Fig. 7 (a) and figure
7 (b) available verifyings, the oscillation amplitude for exchanging transimission power are decreased to 20MW, and the oscillation amplitude of direct current transmission power is also bright
Aobvious to reduce, oscillation of power is calmed down in 10s, and system damping is remarkably reinforced.Therefore, proposed by the present invention to inhibit low frequency using energy storage
The method of oscillation can effectively be applied in AC/DC interconnected system.
Further research energy-storage system promotes effect to the improvement of alternating current-direct current interconnected electric power system large disturbances power-angle stability.
Three phase short circuit fault occurs in interconnection sending end bus when big interference is set as 1s, failure removes failure after continuing 0.1s.Control
Dc power and interconnection AC power waveform before and after energy-storage system progress charge/discharge is as shown in Figure 8.Fig. 8 shows energy storage
Quick response power have certain improvement to the transient stability of system, energy-storage system can effectively dissolve the synchronous interconnection of alternating current-direct current
Redundancy kinetic energy after the system failure.
A kind of power-angle stability lifting system of alternating current-direct current interconnected electric power system, the alternating current-direct current interconnected electric power system are sent
End power grid is connected to energy-storage system, as shown in figure 9, it is improved in that the power-angle stability lifting system includes:
Acquisition unit, it is poor specifically for the generator rotor angle of generator in acquisition alternating current-direct current interconnected electric power system；
First determination unit, for determining the charge/discharge value and power reference of the energy-storage system according to the generator rotor angle difference；
Second determination unit, for determining the discharge/charge electric work of the energy-storage system according to the charge/discharge value and power reference
Rate；
Control unit carries out charge/discharge for the charge/discharge power control energy-storage system based on the energy-storage system.
Further, first determination unit is specifically used for:
The charge/discharge value and power reference of the energy-storage system is determined as the following formula
In formula, Δ ω is that the generator rotor angle of generator in alternating current-direct current interconnected electric power system is poor, TW、WithIt is outer ring controller
Proportion integral modulus, KPFor gain coefficient, s is complex variable.
Specifically, the charge/discharge value and power reference of the energy-storage systemIt needs to meet:Wherein,For the lower limit of the charge/discharge value and power reference of the energy-storage system,Join for the charge/discharge power of the energy-storage system
Examine the upper limit of value.
Further, second determination unit is specifically used for:
The charge/discharge power P of the energy-storage system is determined as the following formulaES:
In formula,For the charge/discharge value and power reference of the energy-storage system, PESFor the charge/discharge of the energy-storage system
Power, TPFor the inertia time constant of inner loop control, s is complex variable.
Specifically, the charge/discharge power P of the energy-storage systemESIt needs to meet:Wherein,For institute
The lower limit of the charge/discharge value and power reference of energy-storage system is stated,For the charge/discharge value and power reference of the energy-storage system
The upper limit.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail referring to above-described embodiment for pipe, it should be understood by those ordinary skilled in the art that: still
It can be with modifications or equivalent substitutions are made to specific embodiments of the invention, and without departing from any of spirit and scope of the invention
Modification or equivalent replacement, should all cover within the scope of the claims of the present invention.
Claims (10)
1. a kind of power-angle stability method for improving of alternating current-direct current interconnected electric power system, the sending end of the alternating current-direct current interconnected electric power system
Power grid is connected to energy-storage system, which is characterized in that the described method includes:
The generator rotor angle for acquiring generator in alternating current-direct current interconnected electric power system is poor；
The charge/discharge value and power reference of the energy-storage system is determined according to the generator rotor angle difference；
The charge/discharge power of the energy-storage system is determined according to the charge/discharge value and power reference；
Charge/discharge power control energy-storage system based on the energy-storage system carries out charge/discharge.
2. the method as described in claim 1, which is characterized in that described to determine the energy-storage system according to the generator rotor angle difference
Charge/discharge value and power reference, comprising:
The charge/discharge value and power reference of the energy-storage system is determined as the following formula
In formula, Δ ω is that the generator rotor angle of generator in alternating current-direct current interconnected electric power system is poor, TW、WithIt is the ratio of outer ring controller
Example integral coefficient, KPFor gain coefficient, s is complex variable.
3. method according to claim 2, which is characterized in that the charge/discharge value and power reference of the energy-storage systemIt need to expire
Foot:Wherein,For the lower limit of the charge/discharge value and power reference of the energy-storage system,For institute
State the upper limit of the charge/discharge value and power reference of energy-storage system.
4. the method as described in claim 1, which is characterized in that described according to charge/discharge value and power reference determination
The charge/discharge power of energy-storage system, comprising:
The charge/discharge power P of the energy-storage system is determined as the following formulaES:
In formula,For the charge/discharge value and power reference of the energy-storage system, PESFor the charge/discharge power of the energy-storage system,
TPFor the inertia time constant of inner loop control, s is complex variable.
5. method as claimed in claim 4, which is characterized in that the charge/discharge power P of the energy-storage systemESIt needs to meet:Wherein,For the lower limit of the charge/discharge value and power reference of the energy-storage system,For the storage
The upper limit of the charge/discharge value and power reference of energy system.
6. a kind of power-angle stability lifting system of alternating current-direct current interconnected electric power system, the sending end of the alternating current-direct current interconnected electric power system
Power grid is connected to energy-storage system, which is characterized in that the power-angle stability lifting system includes:
Acquisition unit, it is poor specifically for the generator rotor angle of generator in acquisition alternating current-direct current interconnected electric power system；
First determination unit, for determining the charge/discharge value and power reference of the energy-storage system according to the generator rotor angle difference；
Second determination unit, for determining the charge/discharge power of the energy-storage system according to the charge/discharge value and power reference；
Control unit carries out charge/discharge for the charge/discharge power control energy-storage system based on the energy-storage system.
7. power-angle stability lifting system as claimed in claim 6, which is characterized in that first determination unit is specifically used
In:
The charge/discharge value and power reference of the energy-storage system is determined as the following formula
In formula, Δ ω is that the generator rotor angle of generator in alternating current-direct current interconnected electric power system is poor, TW、WithIt is the ratio of outer ring controller
Example integral coefficient, KPFor gain coefficient, s is complex variable.
8. the method for claim 7, which is characterized in that the charge/discharge value and power reference of the energy-storage systemIt need to expire
Foot:Wherein,For the lower limit of the charge/discharge value and power reference of the energy-storage system,For institute
State the upper limit of the charge/discharge value and power reference of energy-storage system.
9. power-angle stability lifting system as claimed in claim 6, which is characterized in that second determination unit is specifically used
In:
The charge/discharge power P of the energy-storage system is determined as the following formulaES:
In formula,For the charge/discharge value and power reference of the energy-storage system, PESFor the charge/discharge power of the energy-storage system,
TPFor the inertia time constant of inner loop control, s is complex variable.
10. power-angle stability lifting system as claimed in claim 9, which is characterized in that the discharge/charge electric work of the energy-storage system
Rate PESIt needs to meet:Wherein,For the lower limit of the charge/discharge value and power reference of the energy-storage system,For the upper limit of the charge/discharge value and power reference of the energy-storage system.
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