CN107104463B - Converter station considers idle active input amount optimization method during black starting-up - Google Patents
Converter station considers idle active input amount optimization method during black starting-up Download PDFInfo
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- CN107104463B CN107104463B CN201710505848.3A CN201710505848A CN107104463B CN 107104463 B CN107104463 B CN 107104463B CN 201710505848 A CN201710505848 A CN 201710505848A CN 107104463 B CN107104463 B CN 107104463B
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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
Abstract
The invention discloses a kind of converter stations to consider idle active input amount optimization method during black starting-up.Especially by influence when analysis converter station access power grid to AC system, consider the voltage characteristic of load, in conjunction with power system reactive power-voltage control, estimation is under the premise of guaranteeing that AC system transient frequency is stablized, the maximum active power input amount of converter station, influence of the reactive power to active input amount optimum results under the premise of guaranteeing system transient modelling frequency stabilization is obtained by largely emulating and being fitted.This method principle is simple, it calculates quick, there are a large amount of reactive power impacts when putting into power grid using converter station, AC network is optimized under the premise of guaranteeing transient frequency not unstability, the active buckles of maximum that can be born, make converter station that can provide more active power outputs during black starting-up, is of great significance to the fast quick-recovery of power failure power grid.
Description
Technical field
The invention belongs to electric power network technique field, especially a kind of converter station considers idle active throwing during black starting-up
Enter amount optimization method.
Background technique
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 has also beaten alarm bell to the safe and stable operation of electric system.After large-scale blackout occurs, scientific and reasonable recovery
Scheme can significantly reduce loss caused by large-scale blackout while accelerating system recovering process.Power grid at this stage
The research of recovery, the main recovery for considering conventional thermoelectricity, Hydropower Unit, and constantly improve with high voltage dc transmission technology,
The engineerings such as extra-high voltage direct-current, moral treasured direct current are given again to put into operation in succession, it is subsequent to have entered rule there are also several extra-high voltage direct-current transmission engineerings
Draw the design phase.It is excellent that HVDC transmission system has that transmission capacity is big, distance is remote, loss is low, speed regulation is fast, controllability is strong etc.
Point, and the power-off fault of its receiving end power grid, will not influence the normal operation of sending end power grid.Start direct current during power system restoration
Transmission system rapidly can provide the electric energy of large capacity for power failure power grid, have to the recovering process for accelerating whole system positive
Effect, therefore, the power system restoration routing problem that researching DC participates in are very necessary.
Wherein, the D.C. high voltage transmission of voltage source converter type is modulated using insulated gate bipolar transistor and pulse width
The independent control of active power and reactive power may be implemented in technology.Determine active power when VSC-HVDC Inverter Station uses and determine
When the control mode of reactive power is powered to power grid to be restored, reactive power impacts the liter that can cause ac bus transient voltage
Height, active impact can cause the raising of AC network transient frequency, these factors can all influence the transient stability of weak grid.It is existing
In some research, the influence of influence and reactive power impact to transient voltage usually by active impact to system transient modelling frequency is separated
It is studied, when analyzing the influence factor of frequency response, is not considered influence of the reactive power impact amount to transient frequency usually, so
And found by emulation, reactive power impact when converter station puts into operation can have an impact transient frequency, need to establish based on system
The frequency response mathematical model of idle-voltage characteristic, so that the result that transient frequency solves is more accurate.
But it there is no a kind of method consideration when determining transient frequency response magnitude caused by active impact in the prior art
The influence of reactive power impact amount, this makes set value of the power of the converter station when putting into operation more conservative.Meanwhile in the prior art
Influence not yet stable to transient frequency with rigorous relationship proof generator inertia time constant and reserve factor,
So that the transient frequency response determined is not accurate enough.It can be seen that optimization active power input amount, makes converter station in black starting-up
More active power outputs can be provided in the process, be of great significance to the fast quick-recovery of power failure power grid.
Summary of the invention
The purpose of the present invention is to provide a kind of converter stations to consider the active input amount of idle influence during black starting-up
Optimization method.
The technical solution for realizing the aim of the invention is as follows: a kind of converter station considers idle influence during black starting-up
Active input amount optimization method, includes the following steps:
Step 1 determines AC system parameter, specifically includes 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 the inverter of VSC-HVDC, which is surveyed, uses constant dc power control, and direct current system is extensive
It is Δ P and Δ Q to the equivalent impact of AC system when multiple, is determined according to the AC system parameter that step 1 determines when converter station is extensive
When multiple, the transient voltage of inverter side change of current bus；
It is determined according to the AC system parameter of above-mentioned determination when converter station restores, the transient voltage of inverter side change of current bus
Formula used are as follows:
In formula, Δ V --- to be evaluated, when accessing AC system for converter station, the transient voltage of inverter side change of current bus becomes
Change amount；
P --- original active capacity on change of current bus；
Ssc--- DC converter station access point capacity of short circuit.
Step 3, the transient voltage variable quantity that remaining bus is determined by impedance matrix；Formula used are as follows:
Wherein, UdAnd UiThe transient voltage size of respectively inverter side change of current bus d and node i, U0.dAnd U0.iFor converter station
The voltage swing of inverter side change of current bus d and node i, z before accessingddFor diagonal entry relevant 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 guarantee that power grid transient frequency is stablized, DC converter
It stands the maximum active power output amount that can be put into；Formula used are as follows:
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
Coefficient relevant to system reserve capacity, system reserve capacity is bigger, and K value is bigger.
Step 5, in the case where determining and considering that reactive power influences, maximum active power output amount that DC converter station can be put into；
When considering that DC converter station reactive power influences, frequency response formula caused by active power output amount are as follows:
In formula, Δ f --- it is to be evaluated, it is AC system transient frequency offset；
Δ P " --- converter station considers the equivalent active power buckles after reactive power influence, the following formula of the determination of Δ P "
It is shown:
Wherein, f1For the relational model used in step 2, f2For the relational model used in step 3, f3Indicate load
Voltage characteristic.
Step 6 show that reactive power optimizes active input amount as a result, passing through and being fitted according to what step 4 and step 5 obtained
As a result influence.
Compared with prior art, the present invention its remarkable advantage are as follows: 1) present invention is solving active impact to system transient modelling frequency
When the influence of rate, it is contemplated that idle-voltage characteristic of system can increase as far as possible under the premise of guaranteeing that transient frequency is stablized
To the active input amount of converter station；2) in the present invention, consider generator inertia time constant and reserve factor to temporary in detail
The influence of state frequency stabilization keeps the mathematical model for solving transient frequency more accurate.
Present invention is further described in detail with reference to the accompanying drawing.
Detailed description of the invention
Fig. 1 is the active input amount optimization method process that converter 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.
Specific embodiment
In conjunction with Fig. 1, a kind of converter station of the invention considers the active input amount optimization of idle influence during black starting-up
Method includes the following steps:
Step 1 determines AC system parameter, specifically includes each busbar voltage V, DC converter station access point transient state short circuit is held
Measure Ssc, system loading type；
Busbar voltage is acquired by the Load flow calculation of basic communication system；When calculating transient state capacity of short circuit, generator should be taken
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 acquired according to step 1 calculate DC converter station access and hand over
After galvanic electricity net, the voltage variety of change of current bus.It is determined according to the AC system parameter of above-mentioned determination when converter station restores, it is inverse
Become formula used in the transient voltage of side change of current bus are as follows:
Δ V in formula --- it is to be evaluated, when accessing AC system for converter station, the transient voltage variation of inverter side change of current bus
Amount；
P --- original active capacity on change of current bus；
Ssc--- DC converter station access point capacity of short circuit.
Step 3, according to the voltage variety of change of current bus, solve the voltage variety of remaining ac bus.
Formula used in the transient voltage variable quantity of remaining bus is determined by impedance matrix are as follows:
Wherein, UdAnd UiThe transient voltage size of respectively inverter side change of current bus d and node i, U0.dAnd U0.iFor converter station
Voltage swing before access, zddFor diagonal entry relevant to d in impedance matrix, zidFor impedance matrix interior joint d and node
Element between i.
Step 4, solution do not consider transient frequency and direct current system injection AC network in the case where reactive power influence
The relationship of active power impact size.Determine formula used in maximum active power output amount that DC converter station can be put into are as follows:
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
System relevant to system reserve capacity, system reserve capacity is bigger, and K value is bigger.
Step 5 is calculated in the case where considering that reactive power influences, and transient frequency and direct current system inject AC network
The relationship of active power impact size.When considering that DC converter station reactive power influences, frequency caused by active power output amount is rung
Answer formula are as follows:
In formula, Δ f --- it is to be evaluated, it is AC system transient frequency offset；
Δ P " --- converter station considers the equivalent active power buckles after reactive power influence, the following formula of the determination of Δ P "
It is shown:
Wherein, f1For the relational model used in step 2, f2For the relational model used in step 3, f3Indicate load
Voltage characteristic.
Step 6 show that reactive power optimizes active input amount as a result, passing through and being fitted according to what step 4 and step 5 obtained
As a result 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 for arriving converter station can be increased as far as possible under the premise of guaranteeing that transient frequency is stablized.
Further detailed description is done to the present invention below with reference to embodiment:
Embodiment 1
By taking 3 machine of standard, 9 node system as an example, it is connected with VSC-HVDC DC power transmission line in No. 8 buses, it is imitative by PSCAD
It really obtains the system transient modelling frequency in the case where not considering reactive power buckles influence factor, then is counted using method of the invention
It calculates, obtains the active optimization of investment amount in the case where guaranteeing system transient modelling frequency stabilization, and by PSCAD progress simulating, verifying, two kinds
The partial results statistics of method is as shown in table 1.
Table 1 does not consider that reactive power is influenced 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, consider that idle function calculates
To active power input amount than not considering reactive power in the case where it is bigger, this characteristic when AC system is weaker especially
Obviously, therefore during black starting-up, consider that the reactive power on the new road of direct current transportation can increase the input amount of active power.
The present invention guarantees that transient frequency remains unchanged, and changes the reactive power of direct current system injection AC system, obtaining can
Allow the active power optimized amounts put into more.Using reactive power as abscissa, active power optimized amount is as ordinate, fitting
The relation curve of optimized amount and reactive power amount out, as shown in Fig. 2, it is substantially derived as straight line, therefore in actual operation,
Can be impacted according to reactive power of the DC converter station to AC system proportional properly increasing can be put into converter station it is active
Watt level accelerates the regeneration rate of power failure power grid under the premise of guaranteeing AC network frequency stabilization.
Claims (5)
1. a kind of converter station considers idle active input amount optimization method during black starting-up, which is characterized in that including such as
Lower step:
Step 1 determines AC system parameter, specifically includes each busbar voltage V, DC converter station access point system transient modelling short circuit is held
Measure Ssc, system loading type；
Step 2, during black starting-up, the inverter of VSC-HVDC, which is surveyed, uses constant dc power control, to friendship when direct current system is restored
The equivalent impact of streaming system is Δ P and Δ Q, determines the inversion when converter station restores according to the AC system parameter that step 1 determines
The transient voltage of side change of current bus；
Step 3, the transient voltage variable quantity that remaining bus is determined by impedance matrix；
Step 4 determines that, to guarantee that power grid transient frequency is stablized, DC converter station can when not considering System Reactive Power-voltage characteristic
The maximum active power output amount of investment；
Step 5, when determining that DC converter station considers that reactive power influences, frequency shift (FS) size caused by active power output amount；
Step 6 obtains reactive power to active input amount optimum results according to what step 4 and step 5 obtained as a result, passing through fitting
Influence.
2. converter station according to claim 1 considers idle active input amount optimization method during black starting-up,
It is characterized in that, is determined according to the AC system parameter of above-mentioned determination when converter station restores in step 2, inverter side change of current bus
Formula used in transient voltage are as follows:
In formula, Δ V --- it is to be evaluated, when accessing AC system for converter station, the transient voltage variable quantity of inverter side change of current bus；
P --- original active capacity on change of current bus；
Ssc--- DC converter station access point system transient modelling capacity of short circuit.
3. converter station according to claim 1 considers idle active input amount optimization method during black starting-up,
It is characterized in that, formula used in the transient voltage variable quantity of remaining bus is determined by impedance matrix in step 3 are as follows:
Wherein, UdAnd UiThe transient voltage size of respectively inverter side change of current bus d and node i, U0.dAnd U0.iFor converter station access
The voltage swing of preceding inverter side change of current bus d and node i, zddFor diagonal entry relevant to d in impedance matrix, zidFor resistance
Element between anti-matrix interior joint d and node i.
4. converter station according to claim 1 considers idle active input amount optimization method during black starting-up,
It is characterized in that, formula used in the maximum active power output amount that determining DC converter station can be put into step 4 are as follows:
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 and is
The relevant coefficient of spare capacity of uniting, system reserve capacity is bigger, and K value is bigger.
5. converter station according to claim 1 considers idle active input amount optimization method during black starting-up,
It is characterized in that, when considering that DC converter station reactive power influences in step 5, frequency response formula caused by active power output amount
Are as follows:
In formula, Δ f --- it is to be evaluated, it is AC system transient frequency offset；
Δ P " --- converter station considers the equivalent active power buckles after reactive power influence, the following formula institute of the determination of Δ P "
Show:
Wherein, f1For the relational model used in step 2, f2For the relational model used in step 3, f3Indicate the voltage of load
Characteristic.
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| EP3743975A1 (en) | 2018-01-25 | 2020-12-02 | MHI Vestas Offshore Wind A/S | Black start restoration |
| 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 |
| 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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| CN106471695A (en) * | 2014-11-24 | 2017-03-01 | Abb瑞士股份有限公司 | The method of black starting-up blower fan, wind energy turbine set and recovery wind energy turbine set and blower fan, and the blower fan using the method, wind energy turbine set |
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| WO2012139667A1 (en) * | 2011-04-15 | 2012-10-18 | Siemens Aktiengesellschaft | Black start of wind turbine devices |
| CN106471695A (en) * | 2014-11-24 | 2017-03-01 | Abb瑞士股份有限公司 | The method of black starting-up blower fan, wind energy turbine set and recovery wind energy turbine set and blower fan, and the blower fan using the method, wind energy turbine set |
| CN104753084A (en) * | 2015-04-01 | 2015-07-01 | 成都鼎智汇科技有限公司 | Micro-grid system capable of controlling frequency automatically |
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