CN103337853A - Direct current power adjustment and control method for inhibiting alternating current-direct current coupling weakening stability - Google Patents
Direct current power adjustment and control method for inhibiting alternating current-direct current coupling weakening stability Download PDFInfo
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Abstract
The invention provides a direct current power adjustment and control method for inhibiting the alternating current-direct current coupling weakening stability, which comprises the following steps that (1), an extra-high voltage direct current transmission end alternating current-direct current series-parallel power grid simulation model is established; (2), the transient state stability and the electromechanical oscillation damping characteristic of a transmission end power grid under large disturbance impact are evaluated; (3), a key factor of the alternating current-direct current coupling weakening stability is determined; (4), a power adjustment controller is subjected to direct current configuration; and (5), an effect of power adjustment and control is verified. With the adoption of the method, by using the quick adjustment and control characteristic of extra-high voltage direct current power, an adverse effect of an intercoupling function of an alternating current-direct current system during sharp fluctuation of the electrical quantity after large disturbance on the stability of the power grid is inhibited, and the safe and stable operation capability and the extra-high voltage direct current high-capacity stable power transmission capability of the extra-high voltage direct current transmission end power grid are improved.
Description
Technical field
The invention belongs to field of power, be specifically related to a kind of direct current power regulate and control method that suppresses alternating current-direct current coupling reduction stability.
Background technology
For adapting to the characteristics of primary energy and the reverse distribution of load center, China will build and connect western large-scale water power, thermoelectricity, nuclear power, new forms of energy base and central and east load center, satisfy and stride the extra-high voltage alternating current-direct current electrical network that big area resource is distributed demand rationally.Big capacity extra-high voltage direct-current with exchanges series-parallel connection, many direct currents are intensive sends and feed-in, and transitional period factors such as " friendships a little less than tetanic " will make stabilization of power grids characteristic more complicated.
DC transmission system has the control system of quick response, and after AC network was impacted by big disturbance fault, along with the fast quick-recovery of system voltage, direct current sent electrical power also will increase thereupon.In system's electromechanical oscillations process after fault clearance, direct current power will fluctuate with current conversion station ac bus voltage oscillation.The variation of direct current power also can produce obviously influence to the stability of synchronization of generating set in the AC network and the damping characteristic of electromechanical oscillations conversely.Coupling between interchange and the direct current is the key factor that threatens the series-parallel connection power grid operation, especially builds up at extra-high voltage direct-current and puts into operation and the relative more weak transitional period of AC network.
Disclose the key factor of alternating current-direct current coupling reduction stability, and introduce the vibration electric parameters of the disturbed back of reflection series-parallel connection stabilization of power grids feature on this basis, design direct current power regulation and control controller, improving after the direct current fault and the power characteristic in the lasting electromechanical oscillations process, then is the effective technology measure that suppresses alternating current-direct current coupling reduction stability.Owing to need not to append the primary equipment investment, only introduce dc controller, so this measure economy is higher, can strengthen alternating current-direct current series-parallel connection power network safety operation level, ensure that the big capacity of extra-high voltage direct-current steadily send.
Summary of the invention
The invention provides a kind of direct current power regulate and control method that suppresses alternating current-direct current coupling reduction stability, can strengthen alternating current-direct current series-parallel connection power network safety operation level, ensure that the big capacity of extra-high voltage direct-current steadily send.
For achieving the above object, the invention provides a kind of direct current power regulate and control method that suppresses alternating current-direct current coupling reduction stability, it is characterized in that, said method comprising the steps of:
(1). set up extra-high voltage direct-current sending end alternating current-direct current series-parallel connection grid simulation model;
(2). assess big disturbance and impact sending end electrical network transient stability and electromechanical oscillations damping characteristic down;
(3). determine the key factor of alternating current-direct current coupling reduction stability;
(4). direct current allocating power regulation and control controller;
(5). the effect of checking power regulation.
Preferably, described step (1) comprising: collect AC network data and DC transmission system data; These data comprise: transmission line of alternation current parameter, transformer parameter, DC transmission system controller parameter; Described simulation model comprises: stable state trend computation model and electromechanical transient simulation computation model.
Preferably, in described step (2), utilize alternating current-direct current series-parallel connection electrical network electromechanical transient simulation software to finish described assessment; Described disturbance comprises: alternating current circuit, DC converter station near region three-phase shortcircuit cut-offs a loop line and three-phase shortcircuit cut-offs double line down; Described transient stability is the angle stability of extra-high voltage direct-current sending end generator unit.
Preferably, described key factor comprises: direct current send the electrical power fluctuation in direct current power fast restoration capabilities and the electric parameters fluctuation process; Described step (3) comprising:
(3 ?1). after identifying big disturbance fault clearance, the fast quick-recovery of direct current power is assessed the influence that the generating set synchronism stability is moved by its unit mechanical input power that causes and electromagnetism power output imbalance to the influence of sending end unit electromagnetic power;
(3 ?2). the system electrical amount after the big disturbance fault clearance identified is significantly in the oscillatory process, and the direct current that the vibration of DC converter station busbar voltage causes send the influence of electrical power fluctuation to the damping of sending end unit electromechanical oscillations.
Preferably, in described step (4), after fault clearance, cause that by the ac and dc systems coupling direct current send electrical power to change, and then the problem of reduction sending end generating set stability, DC control system is configured to the described power regulation controller that AC electric quantity is input signal, to improve the recovery characteristics of direct current power after the big disturbance fault clearance, suppresses the alternating current-direct current coupling; Described AC electric quantity comprises: current conversion station exchanges outlet active power; Described power regulation controller comprises: every straight link, time delay process, phase shift link, proportional component and amplitude limit link.
Preferably, described step (5) comprising: the sending end AC network is applied single failure and catastrophe failure impact respectively, and contrast verification direct current power regulation and control controller is to improving the effect of the sending end unit stability of synchronization and elevator electric oscillation damping.
Compared with prior art, beneficial effect of the present invention is:
By direct current power regulate and control method provided by the invention, utilize the quick modulating properties of extra-high voltage direct-current power, suppress after the big disturbance in the electric parameters fluctuation process, the ac and dc systems effect of intercoupling promotes extra-high voltage direct-current sending end power network safety operation ability and the big capacity of extra-high voltage direct-current and steadily send electric energy power the adverse effect of grid stability.
Description of drawings
Fig. 1 suppresses the flow chart of the direct current power regulate and control method of alternating current-direct current coupling reduction stability for the present invention;
Fig. 2 be among the embodiment small stream Luo Du ?the multiple imperial side three-phase N of multiple imperial circuit ?generator second pendulum transient state unstability curve chart during 1 fault;
Fig. 3 be among the embodiment Fu Long ?the multiple imperial side three-phase N of Luzhou circuit ?generator increasing oscillation unstability curve chart during 1 fault;
Fig. 4 is extra-high voltage direct-current power regulation controller schematic diagram among the present invention;
Fig. 5 is that the direct current power regulation and control suppress the generator second pendulum transient state unstability effect schematic diagram among the embodiment;
Fig. 6 is that the direct current power regulation and control suppress generator increasing oscillation unstability effect schematic diagram among the embodiment;
Fig. 7 be among the embodiment direct current power regulation and control to the schematic diagram that influences of the disturbed track of generator.
Embodiment
A kind of direct current power regulate and control method that suppresses alternating current-direct current coupling reduction stability is used for strengthening alternating current-direct current series-parallel connection power network safety operation level, ensures that the big capacity of extra-high voltage direct-current steadily send electricity, may further comprise the steps:
(1). set up extra-high voltage direct-current sending end alternating current-direct current series-parallel connection grid simulation model;
(2). assess big disturbance and impact sending end electrical network transient stability and electromechanical oscillations damping characteristic down;
(3). determine the key factor of alternating current-direct current coupling reduction stability;
(4). direct current is configured to the power regulation controller that AC electric quantity is input signal;
(5). the effect of checking power regulation.
In described step 1, collect AC network data and DC transmission system data, comprise transmission line of alternation current parameter, transformer parameter and interconnected topological structure, DC transmission system control mode and controller parameter.Set up stable state trend computation model and the electromechanical transient simulation computation model of extra-high voltage direct-current sending end alternating current-direct current series-parallel connection electrical network.
In described step 2, utilize alternating current-direct current series-parallel connection electrical network electromechanical transient simulation software, after emphasis was assessed big disturbance short-circuit impact, angle stability and the electromechanical oscillations damping characteristic of extra-high voltage direct-current sending end generator unit comprised AC network single failure and catastrophe failure.
In described step 3, after identifying big disturbance fault clearance, the fast quick-recovery of direct current power is to the influence of sending end unit electromagnetic power, and assessment is by its unit mechanical input power that causes and electromagnetism power output imbalance, to the adverse effect of generating set synchronism stability operation.The system electrical amount after the big disturbance fault clearance identified is sent the electrical power fluctuation because the vibration of DC converter station busbar voltage causes direct current, to the adverse effect of sending end unit electromechanical oscillations damping significantly in the oscillatory process.
In described step 4, after fault clearance, because the ac and dc systems coupling causes direct current and send electrical power to change, and then the problem of reduction sending end generating set stability, choose can sensitive reaction AC system oscillation characteristics electric parameters, and design is the direct current power regulation and control controller of input signal with this electric parameters.Utilize the power regulation controller, improve the recovery characteristics of direct current power after the big disturbance fault clearance, and then suppress the alternating current-direct current coupling, promote extra-high voltage direct-current sending end power network safety operation level.
In described step 5, under the condition of extra-high voltage direct-current allocating power regulation and control controller, the sending end AC network is applied single failure and catastrophe failure impact, and contrast verification direct current power regulation and control controller is to improving the effect of the sending end unit stability of synchronization and elevator electric oscillation damping.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
(1). set up the detailed simulation model of extra-high voltage direct-current sending end alternating current-direct current series-parallel connection electrical network
In Sichuan Electric Power Network, Xi Luodu, to tame dam large hydropower station and ± to give extra-high voltage direct-current sending end electrical network again be example to 800kV/8000MW, collect static parameter, generator and field regulator thereof and governing system model and parameters such as electrical network transmission line of alternation current and transformer, and data such as HVDC (High Voltage Direct Current) transmission system controller parameter, set up stable state trend computation model and the electromechanical transient simulation model of extra-high voltage direct-current sending end alternating current-direct current series-parallel connection electrical network.
(2). assess big disturbance and impact sending end electrical network transient stability and electromechanical oscillations damping characteristic down
Utilize alternating current-direct current series-parallel connection electrical network electromechanical transient simulation software PSD ?BPA, carry out fault scanning emulation to giving extra-high voltage direct-current sending end AC network again.Computational analysis shows that big disturbance fault impacts the back because there is sending end set steady reduction phenomenon in the alternating current-direct current coupling.
Small stream Luo Du power station is to multiple imperial current conversion station double back transmission line, and after multiple imperial current conversion station side three-phase permanent short one loop line cut-offs the fault impact, small stream Luo Du power station unit will lose the transient state angle stability in the second pendulum process, as shown in Figure 2; When multiple imperial current conversion station to three back transmission lines of power station, Luzhou, after multiple imperial current conversion station side three-phase permanent short one loop line cut-offs impact, small stream Luo Du power station unit in follow-up electromechanical oscillations process, the merit angle present increasing oscillation and lose stable, as shown in Figure 3.
(3). determine the key factor of alternating current-direct current coupling reduction stability
After analyzing the big disturbance impact of AC network, extra-high voltage direct-current power recovers and fluctuates to the influence of the sending end generating set stability of synchronization and oscillation damping characteristic.
Under small stream Luo Du impacts to the multiple imperial current conversion station short trouble of multiple imperial circuit, unit second pendulum transient state is crossed in sending end small stream Lip river, and to lose stability of synchronization key factor as follows: during the short trouble, the blocking-up of generator electromagnetism power output, cross unit in uneven driving power effect Xia Xi Lip river and accelerate, station, merit angular advance receiving end Luzhou, communication channel multiple dragon station; Behind the failure removal because sending end merit angular advance, Fu Long ?the Luzhou passage export a large amount of power to system, the unit braking deceleration is crossed in the small stream Lip river; Meanwhile, along with multiple imperial current conversion station voltage after the fault clearance recovers to raise, give extra-high voltage direct-current fast lifting power again and recover to send electricity, direct current is from extra " extraction " power in multiple dragon area, and then causes sending end small stream Lip river to cross unit crossing braking; The braking energy of unit is significantly greater than the acceleration energy that gathers between age at failure in the backswing process; After the backswing of the unit degree of depth, sending end merit angle will significantly lag behind system again, multiple Lu line pours in down a chimney a large amount of accelerating powers from system, giving direct current in the second pendulum process again recovers steadily to send substantially, additional absorbent power no longer, only depend on multiple Lu three loop lines excess power can't be sent, so the small stream Lip river is crossed unit and will be lost transient stability at second pendulum.
Multiple dragon to the multiple imperial current conversion station short trouble of Luzhou circuit impacts down, it is as follows that unit electromechanical oscillations amplification loss of stability key factor is crossed in sending end small stream Lip river: sending end small stream Lip river is crossed when power-angle oscillation widens between unit and system, multiple dragon to Luzhou communication channel line power increases, multiple imperial voltage of oscillation center gradual rolloff; Give direct current rectification side triggering angle of retard α again and progressively reduce, reach minimum trigger angle α
MinThe time, direct current will switch to and decide α by deciding power control
MinControl, direct current power is out of hand and begin to reduce; Direct current reduces sends power outside, and transfer is superimposed to multiple Lu line, thus " help and increase " communication channel flash-up; When the small stream Lip river crossed that the merit angle reduces between unit backswing and system, multiple Lu linear heat generation rate descended, and multiple imperial voltage of oscillation center promotes gradually; Giving direct current power again promotes with current conversion station voltage and increase recovery gradually, direct current extracts power from multiple imperial partial electric grid will " urge to fall " multiple Lu communication channel power fall down, direct current power is with voltage oscillation " help increase short fall " communication channel power fluctuation side by side, and oscillation damping characteristic between sending and major network has weakened.
To sum up analyze, the key factor of alternating current-direct current coupling reduction stability is after the big disturbance fault of direct current the oscillating characteristic of direct current power in recovery characteristics fast and the system electrical amount fluctuation process.Therefore, be to suppress the alternating current-direct current coupling to the adverse effect of stability, key is to change the power characteristic after the direct current fault.
(4). direct current is configured to the secondary power regulation and control controller that AC electric quantity is input signal
For a change the direct current power characteristic after the big disturbance fault needs on the basis of direct current master control system, secondary power regulation and control controller, and as shown in Figure 4, controller is by forming in turn every straight link, time delay process, phase shift link, proportional component and amplitude limit link; Among the figure, Iac_line and Pac_line are respectively alternating current circuit electric current, power, Td, Tf are respectively every straight link and time delay process time constant, A, B, C, D are the constant of phase shift link, K is proportionality coefficient, Pdmax and Pdmin are respectively amplitude limit link upper limit value and lower limit value, and Pmod is the direct current secondary power regulated quantity of controller output, and input signal is active power or the electric current of alternating current circuit.
For guaranteeing direct current secondary power regulating effect, the corresponding alternating current circuit of input signal may be selected to be power or the bigger branch road of current fluctuation amplitude in the electrical network oscillatory process.Correspondence is given extra-high voltage direct-current sending end electrical network again, can select multiple dragon to alternating current circuit, Luzhou power, as the secondary power regulation and control controller input signal of giving extra-high voltage direct-current again.
(5). the effect of checking secondary power regulation and control
After giving extra-high voltage direct-current configuration secondary power regulation and control controller again, the big disturbance fault of simulating, verifying AC network is impacted the effect of improving of following grid stability.
Multiple dragon is impacted down to the multiple imperial current conversion station side short trouble of Luzhou circuit, and additional controller can effectively suppress the fluctuation that direct current power produces with the vibration of current conversion station busbar voltage, and then can alleviate direct current power to " help and increase short falling " effect of AC network vibration.The convergence vibration of unit merit angle, sending end small stream Luo Du power station, disturbed back, stability strengthens.
Under small stream Luo Du impacts to the multiple imperial current conversion station side short trouble of multiple imperial circuit, additional controller can postpone direct current power and recover, thereby significantly reduce direct current from the level of multiple dragon area " extraction " power, effectively alleviating direct current power recovers the sending end unit is crossed the braking influence, improve the maintenance level of sending end unit after the fault, as figure 5 ?shown in 7.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1. a direct current power regulate and control method that suppresses alternating current-direct current coupling reduction stability is characterized in that, said method comprising the steps of:
(1). set up extra-high voltage direct-current sending end alternating current-direct current series-parallel connection grid simulation model;
(2). assess big disturbance and impact sending end electrical network transient stability and electromechanical oscillations damping characteristic down;
(3). determine the key factor of alternating current-direct current coupling reduction stability;
(4). direct current allocating power regulation and control controller;
(5). the effect of checking power regulation.
2. method according to claim 1 is characterized in that, described step (1) comprising: collect AC network data and DC transmission system data; These data comprise: transmission line of alternation current parameter, transformer parameter, DC transmission system controller parameter; Described simulation model comprises: stable state trend computation model and electromechanical transient simulation computation model.
3. method according to claim 1 is characterized in that, in described step (2), utilizes alternating current-direct current series-parallel connection electrical network electromechanical transient simulation software to finish described assessment; Described disturbance comprises: alternating current circuit, DC converter station near region three-phase shortcircuit cut-offs a loop line and three-phase shortcircuit cut-offs double line down; Described transient stability is the angle stability of extra-high voltage direct-current sending end generator unit.
4. method according to claim 1, it is characterized in that: described key factor comprises: direct current send the electrical power fluctuation in direct current power fast restoration capabilities and the electric parameters fluctuation process; Described step (3) comprising:
(3 ?1). after identifying big disturbance fault clearance, the fast quick-recovery of direct current power is assessed the influence that the generating set synchronism stability is moved by its unit mechanical input power that causes and electromagnetism power output imbalance to the influence of sending end unit electromagnetic power;
(3 ?2). the system electrical amount after the big disturbance fault clearance identified is significantly in the oscillatory process, and the direct current that the vibration of DC converter station busbar voltage causes send the influence of electrical power fluctuation to the damping of sending end unit electromechanical oscillations.
5. method according to claim 1, it is characterized in that, in described step (4), after fault clearance, cause that by the ac and dc systems coupling direct current send electrical power to change, and then the problem of reduction sending end generating set stability, DC control system is configured to the described power regulation controller that AC electric quantity is input signal, to improve the recovery characteristics of direct current power after the big disturbance fault clearance, suppress the alternating current-direct current coupling; Described AC electric quantity comprises: current conversion station exchanges outlet active power; Described power regulation controller comprises: every straight link, time delay process, phase shift link, proportional component and amplitude limit link.
6. method according to claim 1, it is characterized in that, described step (5) comprising: the sending end AC network is applied single failure and catastrophe failure impact respectively, and contrast verification direct current power regulation and control controller is to improving the effect of the sending end unit stability of synchronization and elevator electric oscillation damping.
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| CN111769584A (en) * | 2020-07-15 | 2020-10-13 | 华北电力大学 | Stability evaluation method and system for high-voltage direct current receiving end system |
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| CN101895124A (en) * | 2010-05-27 | 2010-11-24 | 中国电力科学研究院 | Coupling assessment method for judging mutual influence of alternating current-direct current parallel/series-parallel systems |
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| CN101895124A (en) * | 2010-05-27 | 2010-11-24 | 中国电力科学研究院 | Coupling assessment method for judging mutual influence of alternating current-direct current parallel/series-parallel systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769584A (en) * | 2020-07-15 | 2020-10-13 | 华北电力大学 | Stability evaluation method and system for high-voltage direct current receiving end system |
| US20220021213A1 (en) * | 2020-07-15 | 2022-01-20 | North China Electric Power University | Method and system for evaluating stability of HVDC receiving end system, and storage medium |
| CN111769584B (en) * | 2020-07-15 | 2022-02-01 | 华北电力大学 | Stability evaluation method and system for high-voltage direct current receiving end system |
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