CN109193633B - The optimal configuration method of direct current rated power in a kind of multi-infeed DC system - Google Patents
The optimal configuration method of direct current rated power in a kind of multi-infeed DC system Download PDFInfo
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- CN109193633B CN109193633B CN201811135436.6A CN201811135436A CN109193633B CN 109193633 B CN109193633 B CN 109193633B CN 201811135436 A CN201811135436 A CN 201811135436A CN 109193633 B CN109193633 B CN 109193633B
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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
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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
- H02J3/381—Dispersed generators
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The present invention proposes a kind of optimal configuration method of direct current rated power in multi-infeed DC system, belongs to Electric Power Network Planning and the running technology field of electric system.This method sets the current nominal power ratio and current nominal power of each direct current first；Then the phase for injecting active power, the reactive power of consumption and busbar voltage with the voltage for the ac bus for measuring each direct current feed-in after the current-order of each direct current of Synchronous lifting, direct current under current nominal power respectively, respectively obtains the equivalent effective short-circuit ratio of more feed-ins and the critical equivalent effective short-circuit ratio of more feed-ins of every direct current；The current nominal power that each direct current is adjusted according to the size of two kinds of short-circuit ratioes of every direct current, finally obtain so that two kinds of short-circuit ratioes of every direct current it is equal rated power proportion.Present invention may determine that in multi-infeed DC system direct current rated power proportion, reference frame can be provided for the planning construction of extensive Ac/dc Power Systems.
Description
Technical field
The invention belongs to the Electric Power Network Plannings of electric system and running technology field, and in particular to a kind of multi-infeed DC system
The optimal configuration method of middle direct current rated power.
Background technique
China's energy resources and workload demand are in contrary distribution, and the extensive trans-regional transmission of electric energy is inevitable.High pressure
Direct current transportation by its large capacity, it is remote, in terms of advantage, have become the weight of China's " transferring electricity from the west to the east "
Want one of mode.Often drop point is in densely populated, economically developed load center for direct current transportation, with the continuous hair of direct current transportation
Exhibition, forms multiple-circuit line drop point as shown in Figure 1 in the multi-infeed DC system of same receiving end power grid.In Fig. 1Zk
∠θkThe respectively equivalent electromotive force and equivalent impedance of AC system k, Zt1k∠θt1k、Zt1n∠θt1n、Ztkn∠θtknRespectively hand over
Streaming system 1, k, 1, n, k, n, between connection impedance, Uk∠δkFor the voltage of ac bus k, Pack、QackRespectively it is to exchange
The active power and reactive power that the k that unites injects, Pk、QkIt is that (AC system that direct current k is connected is AC system k) transmission to direct current k
Active power and consumption reactive power, Bck、QckThe respectively compensating electric capacity of direct current k and its reactive power of compensation, remaining
Under be designated as the physical quantity of 1, n and respectively represent the parameter of system 1, system n, meaning is identical as the parameter meaning of system k.However direct current
Safe and stable operation need the AC system of some strength as support, direct current rated power is excessive or AC system mistake
Weak, then when AC system fluctuates, the possible quiescent voltage unstability of AC system, direct current is easy to happen commutation failure phenomenon.It is more
The static electric voltage stability of direct current feedthrough system and the rated power of direct current are closely related, therefore reasonable disposition multi-infeed DC system
The rated power of direct current is particularly significant in system.
The determination of direct current rated power is generally only dependent upon the exchange that direct current is connected in existing multi-infeed DC system
The workload demand of power grid: how many workload demand of the AC network that certain direct current is connected, then the direct current is conveyed to AC system
Corresponding active power.But existing method can not plan as a whole the power ratio between different direct currents, be easy to cause exchange side total
The timing of workload demand one, the static electric voltage stability at certain direct current feed-in buses is poor, whole quiet of multi-infeed DC system
State voltage stability margin is lower；Or limited by certain stability, multi-infeed DC system reaches static voltage stability
The limit, but the outskirt electric power that AC system integrally dissolves at this time is smaller.Therefore, each item in multi-infeed DC system how is configured
The power ratio of direct current is under the premise of guaranteeing system stable operation, so that AC system outskirt power consumption ability is most strong, or
One timing of person's AC system outskirt power consumption ability, the air extract of multi-infeed DC system entirety is maximum, should
Problem still requires study.
Summary of the invention
Present invention aim to address each direct current rated power in current multi-infeed DC system to match indefinite ask
Topic proposes a kind of optimal configuration method of direct current rated power in multi-infeed DC system.Present invention may determine that more direct current feedbacks
Enter the proportion of direct current rated power in system, reference frame can be provided for the planning construction of extensive Ac/dc Power Systems.
The present invention proposes a kind of optimal configuration method of direct current rated power in multi-infeed DC system, which is characterized in that
The following steps are included:
(1) the rated power proportion for setting each direct current in multi-infeed DC system is used as current nominal power ratio, and
The rated power of each direct current is determined according to current nominal power ratio；
(2) each direct current is run under current nominal power, measures the exchange of every direct current feed-in in multi-infeed DC system
Voltage, the direct current of bus inject the initial phase of active power, the reactive power of consumption and busbar voltage；
By the voltage of the ac bus of i-th direct current feed-in, direct current injection active power, the reactive power of consumption and mother
The measured value of the initial phase of line voltage is denoted as U respectivelyi0、Pi0、Qi0WithThe shutdown angle of i-th direct current and angle of overlap are denoted as
γi、μi；Wherein, i=1,2 ..., n, n are the sum of direct current；
(3) according to itself capacity of every direct current, according to the current-order of each direct current of ratio Synchronous lifting of setting, and
The voltage of the ac bus of every direct current feed-in, direct current inject active power, the nothing of consumption after measurement current-order is promoted respectively
The phase of function power and busbar voltage；
The voltage of the ac bus of i-th direct current feed-in after current-order is promoted, direct current injection active power, consumption
Reactive power and the measured value of phase of busbar voltage be denoted as U respectivelyi1、Pi1、Qi1With
(4) measurement result respectively obtained according to step (2) and step (3) calculates the corresponding equivalent single feedback of every direct current
Enter the equivalent impedance of system, wherein the equivalent impedance of the corresponding equivalent single feedthrough system of i-th direct currentCalculation expression is such as
Under:
Wherein,
WithThe respectively element of the element of the column of the i-th row of system impedance matrix i-th and the i-th row jth column；
(5) equivalent impedance obtained according to the measured value of step (2) and step (4) calculates the corresponding more feedbacks of every direct current
Enter equivalent effective short-circuit ratio, wherein the equivalent effective short-circuit ratio MEESCR of more feed-ins of i-th direct currentiCalculation expression is as follows:
Wherein, ZeqiFor equivalent impedanceCorresponding amplitude；
(6) the corresponding more critical equivalent effective short-circuit ratioes of feed-in of every direct current are calculated, wherein more feed-ins of i-th direct current are faced
The equivalent effective short-circuit ratio MCEESCR in boundaryiCalculation expression is as follows:
Wherein, θeqiFor equivalent impedanceCorresponding impedance angle；
(7) more feed-ins that the equivalent effective short-circuit ratio MEESCR of more feed-ins that comparison step (5) obtains and step (6) obtain are faced
The relative size of the equivalent effective short-circuit ratio MCEESCR in boundary, and determined:
The equivalent effective short-circuit ratio MEESCR of more feed-ins of any one direct current j if it existsjMore feed-ins corresponding equal to its are faced
The equivalent effective short-circuit ratio MCEESCR in boundaryj, then (8) are entered step；Otherwise increase each direct current according to current nominal power ratio
After rated power, step (2) are returned to；
(8) all direct currents are determined:
If the equivalent effective short-circuit ratio MEESCR of more feed-ins of all direct currents is equal to, its corresponding more feed-in is critical equivalent to be had
Short-circuit ratio MCEESCR is imitated, then current nominal power ratio is exactly to make AC system under the premise of guaranteeing system stable operation
Outskirt power consumption ability is most strong or one timing multi-infeed DC system of AC system outskirt power consumption ability is whole
The maximum rated power proportion of air extract, method terminate；
The equivalent effective short-circuit ratio MEESCR of more feed-ins of any direct current i if it does not existiMore feed-ins corresponding not equal to its are faced
The equivalent effective short-circuit ratio MCEESCR in boundaryi, i ≠ j, then by Pi0*MEESCRi/MCEESCRiThe rated power new as direct current i, and
New current nominal power ratio is determined according to the rated power of updated every direct current, then returns to step (1).
The features of the present invention and beneficial effect are:
By the present invention in that much the equivalent effective short-circuit ratio MEESCR of more feed-ins of all direct currents is same in direct current feedthrough system
When the specified function of each direct current in multi-infeed DC system is determined equal to its more critical equivalent effective short-circuit ratio MCEESCR of feed-in
Rate proportion, under the premise of guaranteeing system stable operation, so that the outskirt power consumption ability of AC system is most strong, or exchange
One timing of system outskirt power consumption ability, the voltage stability margin of multi-infeed DC system entirety are maximum.The present invention can be bright
The proportion problem of direct current rated power in true more feed-in Ac/dc Power Systems can be the rule of extensive Ac/dc Power Systems
It draws construction and reference frame is provided.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of multi-infeed DC system.
Fig. 2 is the overall flow block diagram of the method for the present invention.
Specific embodiment
The present invention proposes a kind of optimal configuration method of direct current rated power in multi-infeed DC system, with reference to the accompanying drawing
It is further described with specific embodiment as follows.
The present invention proposes a kind of optimal configuration method of direct current rated power in multi-infeed DC system, suitable for system
Planning stage, overall flow are as shown in Figure 2, comprising the following steps:
(1) the rated power proportion of each direct current (or is adjusted according to step (8) in any given multi-infeed DC system
Power ratio afterwards) it is used as current nominal power ratio, and work as forehead according to what current nominal power ratio determined each direct current
Determining power, (rated power of each direct current should be smaller when setting, to guarantee that system being capable of stable operation；For example, can be by j-th strip
The rated power of direct current is set as the 5% of the capacity of short circuit of AC system j, and the rated power of remaining direct current is set according to power ratio
It is fixed).
(2) each direct current is run under current nominal power, measures the exchange of every direct current feed-in in multi-infeed DC system
Voltage, the direct current of bus inject the initial phase of active power, the reactive power of consumption and busbar voltage.If being put down for one in power grid
The initial phase of the busbar voltage of weighing apparatus node is 0 degree, then the initial phase of the ac bus voltage of direct current injection is equal to the busbar voltage
Phase difference between balance nodes.
The voltage of the ac bus of (i=1,2 ..., n) direct current feed-in, direct current injection active power, consumption by i-th
The measured value of the initial phase of reactive power and busbar voltage is denoted as U respectivelyi0、Pi0、Qi0WithBy the shutdown angle of i-th direct current
γ is denoted as with angle of overlapi、μi；N is the sum of direct current；
(3) according to the current nominal power of every direct current, refer to according to the electric current of each direct current of ratio Synchronous lifting of setting
It enables, in the present embodiment, lifting capacity is 1% (such as three direct currents of three direct current feedthrough systems of every direct current current nominal power
Current nominal power be respectively 0.5,1,1；Current-order so under rated condition is also respectively 0.5,1,1；And after being promoted
Current-order be respectively 0.505,1.01,1.01), and after measurement current-order is promoted respectively every direct current feed-in exchange it is female
Voltage, the direct current of line inject the phase of active power, the reactive power of consumption and busbar voltage；
The voltage of the ac bus of i-th (i=1,2 ..., n) direct current feed-in after current-order is promoted, direct current injection
The measured value of the phase of active power, the reactive power of consumption and busbar voltage is denoted as U respectivelyi1、Pi1、Qi1With
(4) measurement result respectively obtained according to step (2) and step (3) calculates the corresponding equivalent single feedback of every direct current
Enter the equivalent impedance of system, wherein the equivalent impedance of the corresponding equivalent single feedthrough system of i-th (i=1,2 ..., n) direct current
Calculation expression is as follows:
Wherein,
WithThe respectively element of the element of the column of the i-th row of system impedance matrix i-th and the i-th row jth column, belongs to system
Structural parameters.
(5) equivalent impedance obtained according to the measured value of step (2) and step (4) calculates the corresponding more feedbacks of every direct current
Enter equivalent effective short-circuit ratio, wherein the equivalent effective short-circuit ratio MEESCR of more feed-ins of i-th direct currentiCalculation expression is as follows:
Wherein, ZeqiFor equivalent impedanceCorresponding amplitude.
(6) the corresponding more critical equivalent effective short-circuit ratioes of feed-in of every direct current are calculated, wherein more feed-ins of i-th direct current are faced
The equivalent effective short-circuit ratio MCEESCR in boundaryiCalculation expression is as follows:
Wherein, θeqiFor equivalent impedanceCorresponding impedance angle；The equivalent impedance that step (3) obtainsIt is a vector
(add some points above for vector, not adding some points only indicates amplitude for scalar), has amplitude phase, and phase is impedance angle.
(7) more feed-ins that the equivalent effective short-circuit ratio MEESCR of more feed-ins that comparison step (5) obtains and step (6) obtain are faced
The relative size of the equivalent effective short-circuit ratio MCEESCR in boundary, and determined:
The equivalent effective short-circuit ratio MEESCR of more feed-ins of any one direct current j if it existsjMore feedbacks corresponding equal to the direct current
Enter critical equivalent effective short-circuit ratio MCEESCRj, then (8) are entered step；Otherwise it is straight to increase each item according to current nominal power ratio
After the current nominal power of stream, (mode of increase can be selected according to the actual situation, for example, settable each direct current is by identical
Ratio increases respective current nominal power, and in the present embodiment, each direct current is increased by the 10% of respective current nominal power
Greatly), step (2) are returned to.
(8) all direct currents are determined:
If it is critical etc. that the equivalent effective short-circuit ratio MEESCR of more feed-ins of all direct currents at this time is equal to its corresponding more feed-in
Effective short-circuit ratio MCEESCR is imitated, then current nominal power ratio is exactly under the premise of guaranteeing system stable operation, so that exchange
The outskirt power consumption ability of system is most strong or one timing of AC system outskirt power consumption ability, multi-infeed DC system
The maximum rated power proportion of whole air extract, method terminate.
The equivalent effective short-circuit ratio MEESCR of more feed-ins of any direct current i (i ≠ j) if it existsiMore feedbacks corresponding not equal to its
Enter critical equivalent effective short-circuit ratio MCEESCRi, then by Pi0*MEESCRi/MCEESCRiThe specified function new as direct current i (i ≠ j)
Rate, and new current nominal power ratio (the specified function of direct current j at this time is determined according to the rated power of updated every direct current
Rate remains unchanged), then return to step (1).
The invention proposes the optimal configuration methods of direct current rated power in multi-infeed DC system: electric network composition parameter is true
In the case where fixed, the rated power of each direct current is stepped up, while the equivalent effective short-circuit ratio of the more feed-ins for calculating each direct current
The MEESCR and critical equivalent effective short-circuit ratio MCEESCR of more feed-ins, according to the ratio tune of MEESCR under critical state and MCEESCR
The rated power of whole each direct current matches, finally obtain so that the equivalent effective short-circuit ratio MEESCR of more feed-ins of all direct currents simultaneously
The rated power of more feed-in critical equivalent effective short-circuit ratio MCEESCR corresponding equal to its matches, and rated power proportion is
Under the premise of guaranteeing system stable operation so that the outskirt power consumption ability of AC system is most strong or AC system outside
One timing of area's power consumption ability, the maximum power ratio of air extract of multi-infeed DC system entirety.This hair
The optimal configuration method of direct current rated power can be extensive Ac/dc Power Systems in bright mentioned multi-infeed DC system
Planning construction provide reference frame.
Claims (1)
1. the optimal configuration method of direct current rated power in a kind of multi-infeed DC system, which comprises the following steps:
(1) the rated power proportion of each direct current in multi-infeed DC system is set as current nominal power ratio, and according to
Current nominal power ratio determines the rated power of each direct current；
(2) each direct current is run under current nominal power, measures the ac bus of every direct current feed-in in multi-infeed DC system
Voltage, direct current injection active power, the initial phase of the reactive power of consumption and busbar voltage；
By the voltage of the ac bus of i-th direct current feed-in, direct current injection active power, the reactive power of consumption and bus electricity
The measured value of the initial phase of pressure is denoted as U respectivelyi0、Pi0、Qi0WithThe shutdown angle of i-th direct current and angle of overlap are denoted as γi、
μi；Wherein, i=1,2 ..., n, n are the sum of direct current；
(3) according to itself capacity of every direct current, according to the current-order of each direct current of ratio Synchronous lifting of setting, and respectively
Measure the idle function that the voltage of the ac bus of every direct current feed-in, direct current after current-order is promoted inject active power, consumption
The phase of rate and busbar voltage；
Voltage, the direct current of the ac bus of i-th direct current feed-in after current-order is promoted inject active power, the nothing of consumption
The measured value of the phase of function power and busbar voltage is denoted as U respectivelyi1、Pi1、Qi1With
(4) measurement result respectively obtained according to step (2) and step (3) calculates the corresponding equivalent single feed-in system of every direct current
The equivalent impedance of system, wherein the equivalent impedance of the corresponding equivalent single feedthrough system of i-th direct currentCalculation expression is as follows:
Wherein,
WithThe respectively element of the element of the column of the i-th row of system impedance matrix i-th and the i-th row jth column；
(5) equivalent impedance obtained according to the measured value of step (2) and step (4) calculates corresponding more feed-ins of every direct current etc.
Effective short-circuit ratio is imitated, wherein the equivalent effective short-circuit ratio MEESCR of more feed-ins of i-th direct currentiCalculation expression is as follows:
Wherein, ZeqiFor equivalent impedanceCorresponding amplitude；
(6) the corresponding more critical equivalent effective short-circuit ratioes of feed-in of every direct current are calculated, wherein more feed-ins of i-th direct current are critical etc.
Imitate effective short-circuit ratio MCEESCRiCalculation expression is as follows:
Wherein, θeqiFor equivalent impedanceCorresponding impedance angle；
(7) more feed-ins that the equivalent effective short-circuit ratio MEESCR of more feed-ins that comparison step (5) obtains and step (6) obtain are critical etc.
The relative size of effective short-circuit ratio MCEESCR is imitated, and is determined:
The equivalent effective short-circuit ratio MEESCR of more feed-ins of any one direct current i if it existsiMore feed-ins corresponding equal to its are critical equivalent
Effective short-circuit ratio MCEESCRi, then (8) are entered step；Otherwise increase the specified function of each direct current according to current nominal power ratio
After rate, step (2) are returned to；
(8) all direct currents are determined:
If it is critical equivalent effectively short that the equivalent effective short-circuit ratio MEESCR of more feed-ins of all direct currents is equal to its corresponding more feed-in
Road ratio MCEESCR, then current nominal power ratio is exactly make AC system under the premise of guaranteeing system stable operation outer
Area's power consumption ability is most strong or the static state of one timing multi-infeed DC system entirety of AC system outskirt power consumption ability
The maximum rated power proportion of voltage stability margin, method terminate；
The equivalent effective short-circuit ratio MEESCR of more feed-ins of any direct current j if it existsjCorresponding not equal to its more feed-ins are critical equivalent to be had
Imitate short-circuit ratio MCEESCRj, i ≠ j, then by Pj0*MEESCRj/MCEESCRjThe rated power new as direct current j, and according to update
The rated power of every direct current afterwards determines new current nominal power ratio, then returns to step (1).
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| CN111416343B (en) * | 2020-03-18 | 2023-03-10 | 南方电网科学研究院有限责任公司 | Method, device and medium for evaluating DC power boost of power system |
| CN111969617A (en) * | 2020-07-07 | 2020-11-20 | 南方电网科学研究院有限责任公司 | Power grid strength evaluation method and device of multi-direct-current feed-in system containing STATCOM |
| CN112068027B (en) * | 2020-08-26 | 2023-01-17 | 华北电力大学 | Method for identifying short-circuit ratio of flexible direct-current transmission alternating-current system |
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