CN107104463A - Current conversion station considers idle active input amount optimization method during black starting-up - Google Patents
Current conversion station considers idle active input amount optimization method during black starting-up Download PDFInfo
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- CN107104463A CN107104463A CN201710505848.3A CN201710505848A CN107104463A CN 107104463 A CN107104463 A CN 107104463A CN 201710505848 A CN201710505848 A CN 201710505848A CN 107104463 A CN107104463 A CN 107104463A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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Abstract
Idle active input amount optimization method is considered during black starting-up the invention discloses a kind of current conversion station.Especially by influence during analysis current conversion station access power network to AC system, consider the voltage characteristic of load, with reference to power system reactive power-voltage control, estimation is on the premise of ensureing that AC system transient frequency is stable, the maximum active power input amount of current conversion station, drawn by largely emulating and being fitted on the premise of system transient modelling frequency stabilization is ensured, influence of the reactive power to active input amount optimum results.This method principle is simple, calculate quick, the characteristics of there is a large amount of reactive power impacts when putting into power network using current conversion station, optimizing AC network is ensureing transient frequency not on the premise of unstability, the maximum active buckles that can be born, current conversion station is set to provide more active power outputs during black starting-up, it is significant to the fast quick-recovery of power failure power network.
Description
Technical field
The invention belongs to electric power network technique field, particularly a kind of current conversion station considers idle active throwing during black starting-up
Enter amount optimization method.
Background technology
In recent years, a lot of large area blackouts are continuously broken out both at home and abroad, cause huge economic loss and deep
Social influence, also the safe and stable operation to power system beaten alarm bell.After large-scale blackout occurs, scientific and reasonable recovery
Scheme can significantly reduce the loss caused by large-scale blackout while system recovering process is accelerated.Power network at this stage
The research of recovery, it is main to consider conventional thermoelectricity, the recovery of Hydropower Unit, and with the constantly improve of high voltage dc transmission technology,
The engineerings such as the precious direct current of extra-high voltage direct-current, moral are given again to put into operation in succession, subsequently also have several extra-high voltage direct-current transmission engineerings to have been enter into rule
Draw the design phase.It is excellent that HVDC transmission system has that transmission capacity is big, distance is remote, be lost that low, speed governing is fast, controllability is strong etc.
Point, and the power-off fault of its receiving end power network, do not interfere with the normal operation of sending end power network.Start direct current during power system restoration
Transmission system, can rapidly provide the electric energy of Large Copacity for power failure power network, have to the recovering process for accelerating whole system positive
Effect, therefore, the power system restoration routing problem that researching DC is participated in are very necessary.
Wherein, the D.C. high voltage transmission of voltage source converter type uses insulated gate bipolar transistor and pulse width modulation
Technology, it is possible to achieve the independent control of active power and reactive power.Determine active power and fixed when VSC-HVDC Inverter Stations are used
The control mode of reactive power to power network to be restored power when, reactive power impact can cause the liter of ac bus transient voltage
Height, active impact can cause the rise of AC network transient frequency, and these factors can all influence the transient stability of light current net.It is existing
It is usually to separate the active influence of influence and reactive power impact to transient voltage impacted to system transient modelling frequency in some research
Studied, when analyzing the influence factor of frequency response, do not consider influence of the reactive power impact amount to transient frequency generally, so
And, found, reactive power impact when current conversion station puts into operation can produce influence to transient frequency, need to be set up based on system by emulating
The frequency response mathematical modeling of idle-voltage characteristic so that the result that transient frequency is solved is more accurate.
But, a kind of method is there is no in the prior art it is determined that considering during transient frequency response magnitude caused by active impact
The influence of reactive power impact amount, this causes set value of the power of the current conversion station when putting into operation more to guard.Meanwhile, in the prior art
Not yet generator inertia time constant and reserve factor are proved to the stable influence of transient frequency with rigorous relationship,
So that the transient frequency response determined is not accurate enough.As can be seen here, optimize active power input amount, make current conversion station in black starting-up
During more active power outputs can be provided, it is significant to the fast quick-recovery of power failure power network.
The content of the invention
It is an object of the invention to provide the active input amount that a kind of current conversion station considers idle influence during black starting-up
Optimization method.
The technical solution for realizing the object of the invention is：A kind of current conversion station considers idle influence during black starting-up
Active input amount optimization method, comprises the following steps：
Step 1, AC system parameter is determined, specifically include each busbar voltage V, DC converter station access point capacity of short circuit
Ssc, system loading type；
Step 2, during black starting-up, it is assumed that VSC-HVDC inverter is surveyed and uses constant dc power control, and straight-flow system is extensive
It is P and Q to the equivalent impact of AC system when multiple, the AC system parameter determined according to step 1 is determined when current conversion station recovers,
The transient voltage of inverter side change of current bus；
Determined according to the AC system parameter of above-mentioned determination when current conversion station recovers, the transient voltage of inverter side change of current bus
Formula used is：
In formula, Δ V --- to be evaluated, when being current conversion station incoming transport system, the transient voltage of inverter side change of current bus becomes
Change amount；
Δ Q --- the reactive power of AC system is injected by DC line；
P, Δ P --- original active capacity and the active power by DC line injection AC system on change of current bus；
Ssc--- system transient modelling capacity of short circuit.
Step 3, the transient voltage variable quantity for determining by impedance matrix remaining bus；Formula used is：
Wherein, UdAnd UiRespectively inverter side change of current bus d and node i transient voltage size, U0.dAnd U0.iFor current conversion station
Inverter side change of current bus d and the voltage swing of node i, z before accessddFor diagonal entry related to d in impedance matrix, zid
For the element between impedance matrix interior joint d and node i.
When step 4, determination do not consider System Reactive Power-voltage characteristic, to ensure that power network transient frequency is stable, DC converter
Stand the maximum active power output amount that can be put into；Formula used is：
Solving the differential equation can obtain：
Wherein, Δ f is AC system transient frequency offset, and t is the time, and M is generating set inertia time constant, and K is
The coefficient related to system reserve capacity, system reserve capacity is bigger, and K values are bigger.
In the case that step 5, determination consider reactive power influence, the maximum active power output amount that DC converter station can be put into；
When considering the influence of DC converter station reactive power, the frequency response formula caused by active power output amount is：
In formula, Δ f --- it is to be evaluated, it is AC system transient frequency offset；
Δ P " --- current conversion station considers the equivalent active power buckles after reactive power influence, and Δ P's " is defined below formula
It is shown：
Wherein, f1For the relational model used in step 2, f2For the relational model used in step 3, f3Represent load
Voltage characteristic.
Step 6, the result obtained according to 4 and step 5, draw reactive power to active input amount optimum results by fitting
Influence.
Compared with prior art, its remarkable advantage is the present invention：1) present invention is solving active impact to system transient modelling frequency
During the influence of rate, it is contemplated that idle-voltage characteristic of system, can as far as possible it increase on the premise of ensureing that transient frequency is stable
To the active input amount of current conversion station；2) in the present invention, consider generator inertia time constant and reserve factor to temporary in detail
The influence of state frequency stabilization, makes the mathematical modeling of solution transient frequency more accurate.
The present invention is described in further detail below in conjunction with the accompanying drawings.
Brief description of the drawings
Fig. 1 is the active input amount optimization method flow that current conversion station of the present invention considers idle influence during black starting-up
Figure.
Fig. 2 is optimum results matched curve figure of the reactive power input amount to active power input amount.
Embodiment
With reference to Fig. 1, a kind of current conversion station of the invention considers the active input amount optimization of idle influence during black starting-up
Method, comprises the following steps：
Step 1, AC system parameter is determined, specifically include each busbar voltage V, the short circuit of DC converter station access point transient state and hold
Measure Ssc, system loading type；
Busbar voltage is tried to achieve by the Load flow calculation of basic communication system；When calculating transient state capacity of short circuit, generator should take
Transient internal voltage and Stator transient reactance；In order to embody influence of the idle-voltage characteristic to frequency response, herein using to electricity
The most sensitive constant-impedance load of bucklingization is analyzed；
Step 2, the transient state capacity of short circuit i.e. change of current busbar voltage V tried to achieve according to step 1, calculate DC converter station access and hand over
Flow after power network, the voltage variety of change of current bus.Determined according to the AC system parameter of above-mentioned determination when current conversion station recovers, it is inverse
Become side change of current bus transient voltage used in formula into：
Δ V in formula --- it is to be evaluated, when being current conversion station incoming transport system, the transient voltage change of inverter side change of current bus
Amount；
Δ Q --- the reactive power of AC system is injected by DC line；
P, Δ P --- original active capacity and the active power by DC line injection AC system on change of current bus；
Ssc--- system transient modelling capacity of short circuit.
Step 3, the voltage variety according to change of current bus, solve the voltage variety of remaining ac bus.
By impedance matrix determine the transient voltage variable quantity of remaining bus used in formula be：
Wherein, UdAnd UiRespectively inverter side change of current bus d and node i transient voltage size, U0.dAnd U0.iFor current conversion station
Voltage swing before access, zddFor diagonal entry related to d in impedance matrix, zidFor impedance matrix interior joint d and node
Element between i.
Transient frequency and straight-flow system inject AC network in the case that step 4, solution do not consider reactive power influence
Active power impacts the relation of size.Formula used in determining the maximum active power output amount that DC converter station can be put into is：
Solving the differential equation can obtain：
Wherein, Δ f is AC system transient frequency offset, and t is the time, and M is generating set inertia time constant, and K is
The system related to system reserve capacity, system reserve capacity is bigger, and K values are bigger.
Step 5, calculating are in the case where considering reactive power influence, and transient frequency injects AC network with straight-flow system
Active power impacts the relation of size.When considering the influence of DC converter station reactive power, the frequency caused by active power output amount is rung
The formula is answered to be：
In formula, Δ f --- it is to be evaluated, it is AC system transient frequency offset；
Δ P " --- current conversion station considers the equivalent active power buckles after reactive power influence, and Δ P's " is defined below formula
It is shown：
Wherein, f1For the relational model used in step 2, f2For the relational model used in step 3, f3Represent load
Voltage characteristic.
Step 6, the result obtained according to 4 and step 5, draw reactive power to active input amount optimum results by fitting
Influence.
The present invention is when solving influence of the active impact to system transient modelling frequency, it is contemplated that idle-voltage of system is special
Property, the active input amount to current conversion station can be increased as far as possible on the premise of ensureing that transient frequency is stable.
Further detailed description is done to the present invention with reference to embodiment：
Embodiment 1
By taking the node system of 3 machine of standard 9 as an example, VSC-HVDC DC power transmission lines are connected with No. 8 buses, it is imitative by PSCAD
It is true to draw the system transient modelling frequency in the case where not considering reactive power buckles influence factor, then counted using the method for the present invention
Calculate, draw the active optimization of investment amount in the case where ensureing system transient modelling frequency stabilization, and simulating, verifying, two kinds are carried out by PSCAD
The partial results statistics of method is as shown in table 1.
Table 1 is not considered reactive power influence and counted using the result of context of methods
As can be seen from the above table, when the transient frequency variable quantity that AC system allows is fixed, it is considered to which idle work(is calculated
To active power input amount than not considering reactive power in the case of it is bigger, this characteristic when AC system is weaker particularly
Substantially, therefore during black starting-up, it is considered to which the reactive power on the new road of direct current transportation can increase the input amount of active power.
The present invention ensures that transient frequency keeps constant, changes the reactive power that straight-flow system injects AC system, drawing can
Allow the active power optimized amount of many inputs.Using reactive power as abscissa, active power optimized amount is used as ordinate, fitting
Go out the relation curve of optimized amount and reactive power amount, as shown in Fig. 2 straight line is substantially derived as, therefore in practical operation,
Proportional can be put into current conversion station active of properly increasing can be impacted to the reactive power of AC system according to DC converter station
Watt level, on the premise of AC network frequency stabilization is ensured, accelerates the regeneration rate of power failure power network.
Claims (5)
1. a kind of current conversion station considers idle active input amount optimization method during black starting-up, it is characterised in that including such as
Lower step：
Step 1, AC system parameter is determined, specifically include each busbar voltage V, DC converter station access point capacity of short circuit Ssc, be
System load type；
Step 2, during black starting-up, it is assumed that VSC-HVDC inverter, which is surveyed, uses constant dc power control, when straight-flow system is recovered
Equivalent impact to AC system is P and Q, and the AC system parameter determined according to step 1 is determined when current conversion station recovers, inversion
The transient voltage of side change of current bus；
Step 3, the transient voltage variable quantity for determining by impedance matrix remaining bus；
When step 4, determination do not consider System Reactive Power-voltage characteristic, to ensure that power network transient frequency is stable, DC converter station can
The maximum active power output amount of input；
Step 5, determine DC converter station consider reactive power influence when, the frequency shift (FS) size caused by active power output amount；
Step 6, the result obtained according to 4 and step 5, shadow of the reactive power to active input amount optimum results is drawn by fitting
Ring.
2. current conversion station according to claim 1 considers idle active input amount optimization method during black starting-up, its
It is characterised by, is determined in step 2 according to the AC system parameter of above-mentioned determination when current conversion station recovers, inverter side change of current bus
Formula is used in transient voltage：
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Δ Q --- the reactive power of AC system is injected by DC line；
P, Δ P --- original active capacity and the active power by DC line injection AC system on change of current bus；
Ssc--- system transient modelling capacity of short circuit.
3. current conversion station according to claim 1 considers idle active input amount optimization method during black starting-up, its
Be characterised by, in step 3 by impedance matrix determine the transient voltage variable quantity of remaining bus used in formula be：
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4. current conversion station according to claim 1 considers idle active input amount optimization method during black starting-up, its
It is characterised by, formula used in the maximum active power output amount that determination DC converter station can be put into step 4 is：
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5. current conversion station according to claim 1 considers idle active input amount optimization method during black starting-up, its
It is characterised by, when the influence of DC converter station reactive power is considered in step 5, the frequency response formula caused by active power output amount
For：
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Δ P " --- current conversion station considers the equivalent active power buckles after reactive power influence, and Δ P's " is defined below formula institute
Show：
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Characteristic.
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| CN110120676A (en) * | 2019-06-18 | 2019-08-13 | 国网新疆电力有限公司电力科学研究院 | MMC-HVDC converter station Poewr control method and system based on simulation synchronous motor characteristic |
| CN110120676B (en) * | 2019-06-18 | 2023-03-24 | 国网新疆电力有限公司电力科学研究院 | MMC-HVDC converter station power control method and system based on simulation synchronous motor characteristics |
| CN110148972A (en) * | 2019-06-20 | 2019-08-20 | 华北电力大学（保定） | Extension black-start scheme determines method, apparatus and electronic equipment |
| CN110148972B (en) * | 2019-06-20 | 2020-11-03 | 华北电力大学（保定） | Extended black start scheme determining method and device and electronic equipment |
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