CN102684209A - Method for improving sub-synchronous oscillation (SSO) damping of thermal power plant by utilizing fan supplementary controller - Google Patents
Method for improving sub-synchronous oscillation (SSO) damping of thermal power plant by utilizing fan supplementary controller Download PDFInfo
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Abstract
The invention belongs to the power system field and particularly relates to a method for improving the sub-synchronous oscillation (SSO) damping of a thermal power plant in a wind-thermal power series-compensation combined transmission system by utilizing a supplementary controller to modulate the reactive power output of a wind generation set. The method is based on the rotor current active and reactive decoupling control principle of a double-fed wind generation set, and introduces shafting rotational speed difference of a combined-transmission thermal power plant as the characteristic signal for designing a damping controller, and the output of the damping controller is modulation component under the control of rotor reactive power; and through the regulation on the reactive power of the wind generation set, the effect of enhancing the SSO damping of the combined-transmission thermal power plant is achieved. The invention is applicable to large-capacity wind-thermal power combined series capacitance compensation transmission occasions, so the SSO property of the thermal power plant can be improved, the electric power of a new energy resource is ensured to be transmitted safely, continuously and reliably, and the power system is also ensured to operate safely and stably.
Description
Technical field
The invention belongs to field of power, be specifically related to a kind of blower fan additional controller that utilizes and improve fired power generating unit sub-synchronous oscillation (Subsynchronous Oscillation, SSO) method of damping of being incorporated into the power networks.
Background technology
Having a high potential of Wind Power Utilization, the developed installation total capacity of land and wind energy on the sea reach about 7～1,200,000,000 kilowatts, data that up-to-date assessment report proposes even can reach more than 2,500,000,000 kilowatts.Along with the extensive development of wind energy turbine set, the research of wind-powered electricity generation unit, manufacturing and application level developed into the variable speed constant frequency wind-powered electricity generation unit of pursuit wind energy maximum conversion efficiency also in continuous development to the not high constant speed blower fan of Wind Power Utilization efficient from the past.Wherein, because of its plurality of advantages, become the mainstream model of current wind-power market based on the megawatt-level wind unit of double fed induction generators in performance aspect the operation.
In the country with a vast territory of region, wind-powered electricity generation generally adopts the development mode of " extensive, high concentrating " and the transport model of " big capacity, high voltage, remote ".Can the wind-powered electricity generation and the thermoelectricity bundling in the area with abundant wind resource be sent outside; Can remedy the big capacity that uncertainty caused that wind power exerts oneself like this and send passway for transmitting electricity equipment efficiency of usage adverse effect on the low side outside, guarantee the stability and the electric power system operation economy of energy supply.But the electric power system main grid structure in the abundant area of wind-resources is comparatively weak at present, installs series compensation additional through sending passage outside, promotes wind fire bundling ability to send outside and power transmission efficiency, is a kind of feasible technical measures.
Wind fire bundling string benefit is sent outside, when improving new forms of energy ability to send outside and power transmission efficiency, can be increased the threat of sending end fired power generating unit sub-synchronous oscillation, and to the power network safety operation deleterious impact.
Summary of the invention
For overcoming above-mentioned defective; The invention provides a kind of method of utilizing the blower fan additional controller to improve fired power generating unit SSO damping; Utilize idle the exerting oneself of additional controller modulation double-fed fan motor unit, improved the effect of sending fired power generating unit subsynchronous oscillation damping in the system outside.
For realizing above-mentioned purpose, the present invention provides a kind of method of utilizing the blower fan additional controller to improve fired power generating unit SSO damping, and its improvements are, said method comprising the steps of:
(1). set up wind-powered electricity generation unit and the fired power generating unit analogue system of sending outside through series compensation, the said system that sends outside that is incorporated into the power networks comprises fired power generating unit, double-fed fan motor unit and Series Compensated Transmission Lines, and said double-fed fan motor unit comprises rotor Reactive Power Control loop;
(2). input signal Δ Q in said rotor Reactive Power Control loop, carry out numerical simulation and get into stable state up to the said system that sends outside, write down the electromagnetic torque disturbing signal Δ T of said fired power generating unit
e, and obtain Δ T
eAnd the phase-frequency characteristic curve between the Δ Q;
(3). in said wind-powered electricity generation unit, damping controller is set, is used to eliminate the said sub-synchronous oscillation of sending system outside;
(4). verification suppresses the effect of generator sub-synchronous oscillation;
(5). finely tune the parameter of said damping controller, optimize said fired power generating unit subsynchronous oscillation damping characteristic.
In the optimal technical scheme provided by the invention, in said step 1, adopt electromagnetic transient in power system simulation calculation instrument, set up the system that sends outside of said wind-powered electricity generation unit and said fired power generating unit.
In second optimal technical scheme provided by the invention, in said step 2, utilize fourier decomposition to obtain the phase-frequency characteristic curve between Δ Te and Δ Q; Said signal delta Q is the idle reference instruction signal of subsynchronous frequency.
In the 3rd optimal technical scheme provided by the invention; In said step 3; Said damping controller, through the generator speed deviation signal in the said wind-powered electricity generation unit is amplified and phase shift, the generation control signal is regulated the idle of said wind-powered electricity generation unit and is exerted oneself; Make said wind-powered electricity generation unit in inferior frequency domain, the positive electrical damping is provided, eliminate sub-synchronous oscillation for said fired power generating unit.
In the 4th optimal technical scheme provided by the invention, in said step 4, said wind fire bundling is sent outside system apply disturbance, the said damping controller of verification suppresses the effect of generator sub-synchronous oscillation.
In the 5th optimal technical scheme provided by the invention, in said step 1, said wind-powered electricity generation unit comprises wind power system, wind-driven generator and wind power generator control system; It is multimass piece dynamic characteristic that said fired power generating unit is taken into account axle; Wind power generator control system comprises: rotor-side control system that is set up in parallel and stator side control system.
In the 6th optimal technical scheme provided by the invention, said wind-powered electricity generation unit is a doubly-fed variable-speed constant-frequency rate wind-powered electricity generation unit.
In the 7th optimal technical scheme provided by the invention, said rotor-side control system adopts based on stator magnetic linkage oriented power decoupled controller; Said stator side control system adopts based on the directed power decoupled controller of line voltage.
In the 8th optimal technical scheme provided by the invention, in said step 2, in the Reactive Power Control loop of wind-powered electricity generation unit, the inferior frequency domain oscillator signal Δ Q that frequency range is 5 to 55Hz, increment is 1Hz is superimposed to reference instruction value Q
RefOn, that is:
Start simulation calculation and get into stable state until system; Extract Δ Q delta data and generating set electromagnetic torque Te data in the common period; Δ Q and Te are carried out fourier decomposition; The idle reference instruction phasor signal
and the fired power generating unit electromagnetic torque phasor signal
that obtain under the different frequency calculate phase-frequency characteristic, that is:
According to phase-frequency characteristic, confirm that the generator sub-synchronous oscillation threatens Frequency point f
xAnd the compensation of phase of said damping controller under this frequency
The application parameter tuning formulae is confirmed damping controller constant correlation time, and said parameter tuning formula is following:
Said damping controller parameter is adjusted, and said damping controller parameter comprises amplification coefficient K, separated straight link time constant T
wWith lead-lag link time constant T
a, T
b
In the 9th optimal technical scheme provided by the invention, in said step 3, send outside in the system at wind-powered electricity generation and thermoelectricity bundling, the said damping controller of verification suppresses the validity of generator sub-synchronous oscillation; When sending system outside big disturbance taking place, emulation verification damping controller suppresses the validity of generator sub-synchronous oscillation said.
In the tenth optimal technical scheme provided by the invention, ask for said damping controller parameter, to the threat Frequency point f of said sub-synchronous oscillation
xCarry out phase place and amplitude compensation.
In the more preferably technical scheme provided by the invention, said wind power system comprises: the wind speed simulation system that sets gradually, wind wheel unit simulated behavior unit and blade angle control unit; Said wind power system is output as wind-driven generator input machine torque.
Provided by the invention second more preferably in the technical scheme, and said wind turbine generator adopts double fed induction generators; Said wind power generator rotor loop is interconnected through converter and electrical network; Said wind power generator rotor voltage u
RdWith u
RqBe not equal to 0, double fed induction generators is through the said wind power generator rotor external voltage of control, and what may command wind-powered electricity generation unit was exported gains merit and reactive power; Rotate d synchronously
Q0The voltage equation of double fed induction generators is under the coordinate system:
U in the said voltage equation
Sd, u
Sq, u
Rd, u
RqBe respectively the d axle and the q axle component of stator winding and rotor winding voltage; R
sAnd R
rBe respectively stator winding and rotor winding phase resistance; i
Sd, i
Sq, i
Rd, i
RqBe respectively the d axle and the q axle component of stator winding and rotor winding; ω
NBe synchronous rotary speed; S is the rotor slippage; ψ
Sd, ψ
Sq, ψ
Rd, ψ
RqBe respectively the magnetic linkage of stator and rotor d axle and q axle;
The magnetic linkage equation of wind turbine generator is:
ψ
sd＝(L
ss+L
m)i
sd+L
mi
rd
ψ
sq＝(L
ss+L
m)i
sq+L
mi
rq
ψ
rd＝(L
rr+L
m)i
rd+L
mi
sd
ψ
rq＝(L
rr+L
m)i
rq+L
mi
sq
Wherein, L
Ss, L
Rr, L
mBe respectively every leakage inductance mutually of stator and rotor and the mutual inductance between stator and rotor.
The provided by the invention the 3rd more preferably in the technical scheme; Said blower fan control system is divided into two-layer: ground floor is optimum wind power tracking control unit of wind energy conversion system and wind-powered electricity generation unit Reactive Power Control unit, and the optimum wind power tracking of said wind energy conversion system is confirmed the fan rotor optimized rotating speed according to real-time wind speed; Said wind-powered electricity generation unit Reactive Power Control is confirmed the idle reference value of wind-powered electricity generation unit according to the Reactive Power Control strategy; The second layer is the power decoupled control unit, controls determined optimized rotating speed and reactive power reference qref is a controlled target with ground floor, realizes that the meritorious and idle decoupling zero of stator side and rotor-side frequency converter is controlled.
With the prior art ratio; A kind of method of utilizing the blower fan additional controller to improve fired power generating unit SSO damping provided by the invention; According to the basic principle of double-fed fan motor unit rotor current decoupling zero control, be introduced as the damping controller of the fired power generating unit speed error signal design of being incorporated into the power networks, damping controller is output as blower fan reactive power set point modulation product; Through to the idle adjusting of exerting oneself of blower fan, reach the effect of amplification generator group subsynchronous oscillation damping; The double-fed fan motor unit is through controlling rotor current; Have active power and reactive power regulating power fast; In sending end wind fire bundling system, make full use of the power adjustments control of wind-powered electricity generation unit, improved fired power generating unit subsynchronous oscillation damping characteristic; Suppress the vibration of axle system, have better economic property and application prospect.
Description of drawings
The damping controller theory diagram that Fig. 1 attaches for the wind-powered electricity generation unit.
Fig. 2 is a double feedback electric engine control logic sketch map.
Fig. 3 is a rotor-side Frequency Converter Control block diagram.
Fig. 4 mends for wind fire bundling string and sends test macro outside.
Fig. 5 is for being that wind fire bundling string is mended and sent phase-frequency characteristic sketch map between test macro fan rotor Reactive Power Control input and generator electromagnetic torque outside.
Fig. 6 is under output of wind electric field 33% condition, and the additional control of no blower fan generator shaft is the diverging oscillation sketch map.
Fig. 7 is under output of wind electric field 33% condition, and the additional control of blower fan generator shaft system convergence vibration sketch map is arranged.
Fig. 8 is under output of wind electric field 33% condition, and the additional control of blower fan generator electromagnetic torque sketch map is arranged.
Fig. 9 is under output of wind electric field 33% condition, and the meritorious and reactive power sketch map of the additional control of blower fan wind energy turbine set is arranged.
Figure 10 is under output of wind electric field 67% condition, and the additional control of no blower fan generator shaft is the diverging oscillation sketch map.
Figure 11 is under output of wind electric field 67% condition, and the additional control of blower fan generator shaft system convergence vibration sketch map is arranged.
Figure 12 is under output of wind electric field 67% condition, and the additional control of blower fan generator electromagnetic torque sketch map is arranged.
Figure 13 is under output of wind electric field 67% condition, and the meritorious and reactive power sketch map of the additional control of blower fan wind energy turbine set is arranged.
Embodiment
Do further detailed description below in conjunction with the accompanying drawing specific embodiments of the invention.
(1) wind fire bundling string is mended and is sent the detailed modeling of system outside
Adopt the electromagnetic transient in power system emulation tool, set up wind-powered electricity generation unit and wind energy turbine set simulation model, and axle is fired power generating unit model, the string benefit transmission system model of multimass dynamic analog.Wherein, Fig. 1 is a wind-powered electricity generation unit additional controller theory diagram, and Fig. 2 is the control system schematic diagram of double-fed blower fan, and rotor-side Frequency Converter Control target is respectively blower fan output reactive power and the corresponding rotor optimized rotating speed of wind speed in real time; Stator side Frequency Converter Control target is the frequency converter dc voltage and exchanges reactive power.The rotor-side Frequency Converter Control system of double-fed fan motor unit is as shown in Figure 3, and damping controller is output as the modulation signal of rotor Reactive Power Control.
(2) Fig. 4 mends for wind fire bundling string and sends test macro outside, wherein send end regions to insert a large-scale wind electricity field, and wind energy turbine set has 100 double-fed fan motor units, and the unit rated capacity is 1.5MW, inserts electrical network through the two-stage step-up transformer.
Apply the small-signal Δ Q of a series of 5-55Hz at fan rotor Reactive Power Control reference settings value place, said signal delta Q is the idle reference instruction signal of the subsynchronous frequency of small magnitude, that is:
Start simulation calculation and get into stable state, extract Δ Q delta data and generator electromagnetic torque T in the common period until system
eData are to Δ Q and T
eCarry out fourier decomposition, and calculate phase-frequency characteristic:
(3), confirm that the generator sub-synchronous oscillation threatens Frequency point f according to phase-frequency characteristic as shown in Figure 5
xAnd the compensation of phase of subsynchronous oscillation damping controller under this frequency
Be respectively 32Hz and 50 °.
Use additional controller parameter tuning formula, and combine time-domain-simulation to calculate effect, confirm additional controller parameter K=2, T
w=10, T
a=0.0074, T
b=0.0032; Wherein, amplification coefficient K, separated straight link time constant T
wWith lead-lag link time constant T
a, T
b
Said parameter tuning formula is following:
Said damping controller parameter comprises amplification coefficient K, separated straight link time constant T
wWith lead-lag link time constant T
a, T
b
(4) under the different service conditionss of wind energy turbine set, verify that it suppresses the validity of generator sub-synchronous oscillation.
Through changing wind speed, to investigate under the different service capacity levels of wind energy turbine set, the blower fan additional controller suppresses the effect of generator sub-synchronous oscillation.
Three-phase instantaneous short-circuit fault is set on transmission line, and getting its generator angular speed deviation signal is the input signal of blower fan additional controller, output signal Q
pBe superimposed to reference settings value Q
Ref1On.Change the wind speed size, make output of wind electric field be respectively 50MW, 100MW.
Fig. 6-Fig. 9 is under the output of wind electric field 50MW condition, and generator shaft is diverging oscillation and configuration damping controller rear axle system convergence oscillating curve during the additional control of no blower fan, and the generator electromagnetic torque, wind energy turbine set is meritorious and curve such as reactive power.Can see that from figure introduce damping controller to the modulation of wind energy turbine set reactive power, significantly the subsynchronous oscillation damping of amplification generator group is kept the stable of axle system.
Figure 10-Figure 13 is under the output of wind electric field 100MW condition, and generator shaft is diverging oscillation and configuration damping controller rear axle system convergence oscillating curve during the additional control of no blower fan, and the generator electromagnetic torque, wind energy turbine set is meritorious and curve such as reactive power.Can see that from figure introduce damping controller to the modulation of wind energy turbine set reactive power, significantly the subsynchronous oscillation damping of amplification generator group is kept the stable of axle system.
What need statement is that content of the present invention and embodiment are intended to prove the practical application of technical scheme provided by the present invention, should not be construed as the qualification to protection range of the present invention.Those skilled in the art can do various modifications, be equal to replacement or improvement under spirit of the present invention and principle inspiration.But these changes or modification are all in the protection range that application is awaited the reply.
Claims (14)
1. a method of utilizing the blower fan additional controller to improve fired power generating unit SSO damping is characterized in that, said method comprising the steps of:
(1). set up wind-powered electricity generation unit and the fired power generating unit analogue system of sending outside through series compensation, the said system that sends outside that is incorporated into the power networks comprises fired power generating unit, double-fed fan motor unit and Series Compensated Transmission Lines, and said double-fed fan motor unit comprises rotor Reactive Power Control loop;
(2). input signal Δ Q in said rotor Reactive Power Control loop, carry out numerical simulation and get into stable state up to the said system that sends outside, write down the electromagnetic torque disturbing signal Δ T of said fired power generating unit
e, and obtain Δ T
eAnd the phase-frequency characteristic curve between the Δ Q;
(3). in said wind-powered electricity generation unit, damping controller is set, is used to eliminate the said sub-synchronous oscillation of sending system outside;
(4). verification suppresses the effect of generator sub-synchronous oscillation;
(5). finely tune the parameter of said damping controller, optimize said fired power generating unit subsynchronous oscillation damping characteristic.
2. method according to claim 1 is characterized in that, in said step 1, adopts electromagnetic transient in power system simulation calculation instrument, sets up the system that sends outside of said wind-powered electricity generation unit and said fired power generating unit.
3. method according to claim 1 is characterized in that, in said step 2, utilizes fourier decomposition to obtain the phase-frequency characteristic curve between Δ Te and Δ Q; Said signal delta Q is the idle reference instruction signal of subsynchronous frequency.
4. method according to claim 1; It is characterized in that, in said step 3, said damping controller; Through the generator speed deviation signal in the said wind-powered electricity generation unit is amplified and phase shift; The generation control signal is regulated the idle of said wind-powered electricity generation unit and is exerted oneself, and makes said wind-powered electricity generation unit in inferior frequency domain, for said fired power generating unit the positive electrical damping is provided, and eliminates sub-synchronous oscillation.
5. method according to claim 1 is characterized in that, in said step 4, said wind fire bundling is sent outside system apply disturbance, and the said damping controller of verification suppresses the effect of generator sub-synchronous oscillation.
6. according to the described method of claim 1-5, it is characterized in that in said step 1, said wind-powered electricity generation unit comprises wind power system, wind-driven generator and wind power generator control system; It is multimass piece dynamic characteristic that said fired power generating unit is taken into account axle; Wind power generator control system comprises: rotor-side control system that is set up in parallel and stator side control system.
7. method according to claim 6 is characterized in that, said wind-powered electricity generation unit is a doubly-fed variable-speed constant-frequency rate wind-powered electricity generation unit.
8. method according to claim 7 is characterized in that, said rotor-side control system adopts based on stator magnetic linkage oriented power decoupled controller; Said stator side control system adopts based on the directed power decoupled controller of line voltage.
9. according to the described method of claim 1-5, it is characterized in that, in said step 2, in the Reactive Power Control loop of wind-powered electricity generation unit, the inferior frequency domain oscillator signal Δ Q that frequency range is 5 to 55Hz, increment is 1Hz is superimposed to reference instruction value Q
RefOn, that is:
Start simulation calculation and get into stable state until system; Extract Δ Q delta data and generating set electromagnetic torque Te data in the common period; Δ Q and Te are carried out fourier decomposition; The idle reference instruction phasor signal
and the fired power generating unit electromagnetic torque phasor signal
that obtain under the different frequency calculate phase-frequency characteristic, that is:
According to phase-frequency characteristic, confirm that the generator sub-synchronous oscillation threatens Frequency point f
xAnd the compensation of phase of said damping controller under this frequency
The application parameter tuning formulae is confirmed damping controller constant correlation time, and said parameter tuning formula is following:
Said damping controller parameter is adjusted, and said damping controller parameter comprises amplification coefficient K, separated straight link time constant T
wWith lead-lag link time constant T
a, T
b
10. according to the described method of claim 1-5, it is characterized in that, in said step 3, send outside in the system that the said damping controller of verification suppresses the validity of generator sub-synchronous oscillation at wind-powered electricity generation and thermoelectricity bundling; When sending system outside big disturbance taking place, emulation verification damping controller suppresses the validity of generator sub-synchronous oscillation said.
11. method according to claim 9 is characterized in that, asks for said damping controller parameter, to the threat Frequency point f of said sub-synchronous oscillation
xCarry out phase place and amplitude compensation.
12. method according to claim 7 is characterized in that, said wind power system comprises: the wind speed simulation system that sets gradually, wind wheel unit simulated behavior unit and blade angle control unit; Said wind power system is output as wind-driven generator input machine torque.
13. method according to claim 7 is characterized in that, said wind turbine generator adopts double fed induction generators; Said wind power generator rotor loop is interconnected through converter and electrical network; Said wind power generator rotor voltage u
RdWith u
RqBe not equal to 0, double fed induction generators is through the said wind power generator rotor external voltage of control, and what may command wind-powered electricity generation unit was exported gains merit and reactive power; Rotate d synchronously
Q0The voltage equation of double fed induction generators is under the coordinate system:
U in the said voltage equation
Sd, u
Sq, u
Rd, u
RqBe respectively the d axle and the q axle component of stator winding and rotor winding voltage; R
sAnd R
rBe respectively stator winding and rotor winding phase resistance; i
Sd, i
Sq, i
Rd, i
RqBe respectively the d axle and the q axle component of stator winding and rotor winding; ω
NBe synchronous rotary speed; S is the rotor slippage; ψ
Sd, ψ
Sq, ψ
Rd, ψ
RqBe respectively the magnetic linkage of stator and rotor d axle and q axle;
The magnetic linkage equation of wind turbine generator is:
ψ
sd＝(L
ss+L
m)i
sd+L
mi
rd
ψ
sq＝(L
ss+L
m)i
sq+L
mi
rq
ψ
rd＝(L
rr+L
m)i
rd+L
mi
sd
ψ
rq＝(L
rr+L
m)i
rq+L
mi
sq
Wherein, L
Ss, L
Rr, L
mBe respectively every leakage inductance mutually of stator and rotor and the mutual inductance between stator and rotor.
14. method according to claim 7; It is characterized in that; Said blower fan control system is divided into two-layer: ground floor is optimum wind power tracking control unit of wind energy conversion system and wind-powered electricity generation unit Reactive Power Control unit, and the optimum wind power tracking of said wind energy conversion system is confirmed the fan rotor optimized rotating speed according to real-time wind speed; Said wind-powered electricity generation unit Reactive Power Control is confirmed the idle reference value of wind-powered electricity generation unit according to the Reactive Power Control strategy; The second layer is the power decoupled control unit, controls determined optimized rotating speed and reactive power reference qref is a controlled target with ground floor, realizes that the meritorious and idle decoupling zero of stator side and rotor-side frequency converter is controlled.
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| US10819262B2 (en) | 2017-09-21 | 2020-10-27 | General Electric Company | Power generation system, system for suppressing sub-synchronous oscillation and method for controlling operation of power system |
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