CN106099955B - A method of blocking subsynchronous frequency component in HVDC control loop - Google Patents
A method of blocking subsynchronous frequency component in HVDC control loop Download PDFInfo
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- CN106099955B CN106099955B CN201610607387.6A CN201610607387A CN106099955B CN 106099955 B CN106099955 B CN 106099955B CN 201610607387 A CN201610607387 A CN 201610607387A CN 106099955 B CN106099955 B CN 106099955B
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- Control Of Eletrric Generators (AREA)
Abstract
The invention belongs to technical field of electric power system control more particularly to a kind of methods for blocking subsynchronous frequency component in HVDC control loop, and the torsion frequency of generator shafting that there are problems that sub-synchronous oscillation is calculated or obtained by surveying according to generator parameter；The frequency centered on the torsion frequency of generator shafting designs bandstop filter or bandpass filter；Designed bandstop filter or bandpass filter are accessed in HVDC rectification side dc power or the control loop of DC current and filter out the subsynchronous frequency component in dc power or DC current measurement.Suppressing method proposed by the present invention, using the research achievement of the mechanism and damping susceptibility of Large-scale fire-electricity unit and the interaction of HVDC control loop as foundation, clear physical concept, it calculates easy, engineering construction is simple and easy, convenient for practical application, the sub-synchronous oscillation that Large-scale fire-electricity unit is sent out through HVDC is effectively solved the problems, such as.
Description
Technical field
The invention belongs to subsynchronous frequencies in technical field of electric power system control more particularly to a kind of blocking HVDC control loop
The method of rate component.
Background technique
Subsynchronous oscillation of electrical power system (Subsynchronous Oscillation, SSO) is since machinery is set in system
The dynamic behaviour that standby and electrical equipment dynamic characteristic coupling is caused, betides Large-scale fire-electricity unit earliest and string benefit is defeated
Between electric line, thereafter with the development of high voltage dc transmission technology and its in Large-scale fire-electricity unit group's high pressure long distance power transmission
Application, occur between Large-scale fire-electricity unit shafting and HVDC rectification side and its dc power or DC current control loop
The interaction of sub-synchronous oscillation problem, referred to as subsynchronous oscillation (Subsynchronous Torsional Interaction,
SSTI), the extensive concern of Electrical Engineer and related scholar are caused.Researcher proposes a series of analyses and inhibition
HVDC causes the method for fired power generating unit sub-synchronous oscillation.Wherein, more frequently with suppressing method be HVDC direct current additional damping
SSDC is controlled, extracts subsynchronous frequency component from rectification side change of current busbar voltage, and exist as feedback control signal
Additional control link in the dc power and DC current of HVDC rectification side improves system by adjusting dc power secondary same
Electrical damping under synchronizing frequency.But content of the subsynchronous frequency component in rectification side change of current busbar voltage is relatively small, in reality
More difficulty, inhibitory effect are extracted in the engineering of border to it to be restricted.In addition, SSDC relies primarily on the inhibition of sub-synchronous oscillation
The correction of phase is compensated in its controlling unit, it is therefore desirable to carry out a large amount of emulation and on-the-spot test work, implement non-
It is often inconvenient.
HVDC is to lead to the basic reason of sub-synchronous oscillation to the weakening of system electrical damping where fired power generating unit.Study table
Bright, in the interaction path of fired power generating unit and HVDC, system electrical damps, Trigger Angle most sensitive to trigger angle control amount
The minor change of control amount is the large variation that system electrical can be caused to damp, and HVDC rectification side current control loop is shape
At the important link of trigger angle control amount, it can be considered to weaken the method for this sensitivity, to block fired power generating unit
With interaction path of the HVDC under subsynchronous frequency.Compared with other methods, this thinking more directly effectively, and is convenient for work
Journey is implemented.
Summary of the invention
For the significantly more efficient sub-synchronous oscillation for solving the problems, such as Large-scale fire-electricity unit and being sent out through HVDC, the invention proposes
A method of blocking subsynchronous frequency component in HVDC control loop, comprising:
Step 1: the generator shaft that there are problems that sub-synchronous oscillation is calculated or obtained by surveying according to generator parameter
The torsion frequency of system；
Step 2: the frequency centered on the torsion frequency of generator shafting designs bandstop filter or bandpass filter；
Step 3: by designed bandstop filter or bandpass filter access HVDC rectification side dc power or direct current
The subsynchronous frequency component in dc power or DC current measurement is filtered out in the control loop of stream.
The bandstop filter is the wide bandstop filter of the torsion frequency comprising generator shafting or is only comprising a certain
The tandem compound of the narrow bandstop filter of generator torsional vibration frequency or multiple above-mentioned bandstop filters.
The bandpass filter is the torsion frequency comprising the generator shafting and phase offset is at torsion frequency
The parallel combination of zero one or more narrow-band pass filters.
The bandstop filter connect with the measurement of dc power or DC current after directly as control signal.
The bandpass filter connect with the measurement of dc power or DC current after with dc power or DC current
As control signal after subtracting each other and being reversed.
The beneficial effects of the present invention are: suppressing method proposed by the present invention is controlled back with Large-scale fire-electricity unit and HVDC
The mechanism of road interaction and the research achievement of damping susceptibility are foundation, and clear physical concept calculates easy, engineering construction letter
It is single easy, it is convenient for practical application, effectively solves the problems, such as the sub-synchronous oscillation that Large-scale fire-electricity unit is sent out through HVDC.
Detailed description of the invention
Fig. 1 is line chart of the typical fired power generating unit through direct current transmitting system.
Fig. 2 is the block diagram of HVDC rectification side current control loop.
Fig. 3 is the block diagram using the HVDC rectification side current control loop of bandstop filter.
Fig. 4 is the oscillating curve using present invention front and back generator shafting.
Specific embodiment
With reference to the accompanying drawing, embodiment is described in detail.
Fig. 1 is line chart of the typical fired power generating unit through direct current transmitting system, and wherein fired power generating unit #1 and #2 distance HVDC are whole
It is nearest to flow side, there are problems that the sub-synchronous oscillation of diverging.Fired power generating unit has been calculated according to the shafting parameter of generating set first
There are the negative damping sub-synchronous oscillations that torsion frequency is 13Hz between HVDC.
Fig. 2 is the block diagram of HVDC rectification side current control loop, the frequency centered on the torsion frequency of generator shafting,
Design bandstop filter or bandpass filter；Designed bandstop filter or bandpass filter are accessed into HVDC rectification side direct current
The subsynchronous frequency component in dc power or DC current measurement is filtered out in the control loop of power or DC current.
Fig. 3 is using the block diagram of the HVDC rectification side current control loop of bandstop filter, IdFor the actual DC of HVDC
Electric current, IorderFor rectification side DC current instruction value, KPAnd KI/ S is respectively the increasing of the PI controlling unit of HVDC rectification side electric current
Beneficial part and integral part, f (R, I) be from DC current control loop to the transmission function the actual DC magnitude of current,For the transmission function of DC current measurement link.
In this embodiment, bandstop filter employed in the present invention is surveyed with the DC current after measurement links
Magnitude series connection, carries out feedback control after making the difference with current instruction value.Since generator torsional vibration frequency is 13Hz, in this implementation
In scheme, used bandstop filter frequency centered on 13Hz, suppressed frequency band is [5Hz 21Hz], is filtered using Butterworth
Wave device.
In the case of Fig. 4 is fault disturbance excitation sub-synchronous oscillation, using the oscillatory condition of generator shafting before and after the present invention,
As can be seen that being decayed rapidly using the sub-synchronous oscillation that divergence problem can will be present in the present invention.
This embodiment is merely preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims
Subject to.
Claims (2)
1. a kind of method for blocking subsynchronous frequency component in HVDC control loop characterized by comprising
Step 1: the generator shafting that there are problems that sub-synchronous oscillation is calculated or obtained by surveying according to generator parameter
Torsion frequency；
Step 2: the frequency centered on the torsion frequency of generator shafting designs bandstop filter or bandpass filter；
Step 3: by designed bandstop filter or bandpass filter access HVDC rectification side dc power or DC current
The subsynchronous frequency component in dc power or DC current measurement is filtered out in control loop；
The bandstop filter is the wide bandstop filter of the torsion frequency comprising generator shafting or is only comprising a certain power generation
The tandem compound of the narrow bandstop filter of machine torsional vibration frequency or multiple above-mentioned bandstop filters；
The bandpass filter is the torsion frequency comprising the generator shafting and phase offset is zero at torsion frequency
The parallel combination of one or more narrow-band pass filters；
The bandpass filter subtracts each other after connecting with the measurement of dc power or DC current with dc power or DC current
And it is reversed rear as control signal.
2. method according to claim 1, which is characterized in that the amount of the bandstop filter and dc power or DC current
Directly as control signal after measurement series connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610607387.6A CN106099955B (en) | 2016-07-28 | 2016-07-28 | A method of blocking subsynchronous frequency component in HVDC control loop |
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| CN201610607387.6A CN106099955B (en) | 2016-07-28 | 2016-07-28 | A method of blocking subsynchronous frequency component in HVDC control loop |
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| CN106099955A CN106099955A (en) | 2016-11-09 |
| CN106099955B true CN106099955B (en) | 2019-06-18 |
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| CN110970927B (en) * | 2019-12-16 | 2021-03-26 | 国家电网公司华北分部 | Method and system for restraining sub-synchronous oscillation of grid-side converter of direct-drive fan |
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| CN101834447A (en) * | 2010-03-23 | 2010-09-15 | 浙江大学 | Method for suppressing sub-synchronous oscillation based on thyristor controlled reactor |
| CN101834446A (en) * | 2010-03-23 | 2010-09-15 | 浙江大学 | Sub-synchronous oscillation suppression method based on controlled series compensation |
| CN102769297A (en) * | 2012-07-12 | 2012-11-07 | 华北电力大学 | Sub-synchronous oscillation suppression method based on fully-controlled inverter |
| CN103208795A (en) * | 2013-03-18 | 2013-07-17 | 华北电力大学 | Method for optimizing parameters of supplementary sub-synchronous damping controller for high-voltage direct-current transmission |
| CN103730903A (en) * | 2013-11-29 | 2014-04-16 | 南方电网科学研究院有限责任公司 | Flexible direct current additional subsynchronous oscillation control system for restraining subsynchronous resonance and oscillation |
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2016
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101834447A (en) * | 2010-03-23 | 2010-09-15 | 浙江大学 | Method for suppressing sub-synchronous oscillation based on thyristor controlled reactor |
| CN101834446A (en) * | 2010-03-23 | 2010-09-15 | 浙江大学 | Sub-synchronous oscillation suppression method based on controlled series compensation |
| CN102769297A (en) * | 2012-07-12 | 2012-11-07 | 华北电力大学 | Sub-synchronous oscillation suppression method based on fully-controlled inverter |
| CN103208795A (en) * | 2013-03-18 | 2013-07-17 | 华北电力大学 | Method for optimizing parameters of supplementary sub-synchronous damping controller for high-voltage direct-current transmission |
| CN103730903A (en) * | 2013-11-29 | 2014-04-16 | 南方电网科学研究院有限责任公司 | Flexible direct current additional subsynchronous oscillation control system for restraining subsynchronous resonance and oscillation |
Non-Patent Citations (1)
| Title |
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| 电力系统次同步振荡抑制方法概述;王瑞闯;《电网与清洁能源》;20110228;第27卷(第2期);第47-51页 |
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