CN104022522A - Method for cooperatively controlling multiport flexible DC power transmission system - Google Patents
Method for cooperatively controlling multiport flexible DC power transmission system Download PDFInfo
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- CN104022522A CN104022522A CN201410253118.5A CN201410253118A CN104022522A CN 104022522 A CN104022522 A CN 104022522A CN 201410253118 A CN201410253118 A CN 201410253118A CN 104022522 A CN104022522 A CN 104022522A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a method for cooperatively controlling a multiport flexible DC power transmission system. The DC power transmission system comprises a dominant convertor station, a wind power plant convertor station, an auxiliary convertor station and an active power control convertor station. The dominant convertor station is used for controlling the DC voltages of the entire system. The wind power plant convertor station is in charge of collecting the active power of a wind power plant group. The auxiliary convertor station is used for assisting to achieve control over the DC voltages of the system. The active power control convertor station is used for transforming constant active power to an AC side power grid. The auxiliary convertor station and the active power control convertor station are both controlled based on the improved DC voltage -active power coastdown adjusting characteristics. The method for cooperatively controlling the multiport flexible DC power transmission system has the advantages of being used for DC voltage control and active power distribution of all convertor stations of the multiport flexible DC power transmission system under any operation stations, and it is guaranteed that the multiport flexible DC power transmission system is in smooth transition between various operation states.
Description
Technical field
The present invention relates to electric field, relate in particular to a kind of multiterminal flexible DC power transmission system coordination control method based on improving decline regulating characteristics.
Background technology
Under energy scarcity and the increasingly serious situation of environmental pollution, countries in the world constantly expand in the input aspect the renewable energy power generations such as wind energy, solar energy, and wherein the exploitation of extensive offshore wind farms has become the main trend of Wind Power Utilization in the world.Because marine wind electric field is away from seashore, the bank land electrical network that it connects is also much weaker, wind-electricity integration all has considerable influence to the stability of connected electrical network and the quality of power supply etc., when developing offshore wind farm on a large scale, multiterminal flexible DC power transmission becomes optimal selection, so its correlative study has been subject to paying close attention to widely.DC voltage control strategy is the importance of multiterminal Technology of HVDC based Voltage Source Converter, and it has directly determined stability and the reliability of device operation.
For guaranteeing DC voltage control and the active power distribution of transmission system under normal operation, abnormal running and fault condition, need to develop in a hurry a kind of multiterminal flexible DC power transmission system coordination control strategy.The patent No. is 201310585802 Chinese patent: " a kind of control system and control method thereof of multiterminal flexible DC power transmission system "; disclose a kind of control system and control method thereof of multiterminal flexible DC power transmission system, this patent is by calculating multiterminal DC network trend and analyzing and formulate control & protection strategy and realize control method.The patent No. is 201210442336 Chinese patent: " a kind of multiterminal flexible DC power transmission system coordination control method ", disclose a kind of multiterminal flexible DC power transmission system coordination control method, when between this patent has provided and stood, communication effectively and between station, in communication failures situation, stop transport because of fault in leading station, slave station switches to the control method for coordinating of DC voltage control.The defect that above patent and prior art exist is:
Thereby 1.201310585802 Chinese patents have only provided a kind of optimal load flow according to DC network and have analyzed and formulated the method that control & protection strategy is realized control; the DC voltage control of multiterminal flexible DC power transmission system under all operating conditions cannot be guaranteed, especially the system safety under the extreme operating conditions such as current conversion station stoppage in transit cannot be guaranteed.
2.201210442336 Chinese patents have only provided between a kind of station the control method for coordinating that slave station when communication effectively and between station, in communication failures situation, stop transport because of fault in leading station switches to DC voltage control.The method realizes the DC voltage control under fault condition by the control mode switch of standby station, and its defect is that the system concussion in control mode switch process is larger, cannot realize seamlessly transitting of system running state; Meanwhile, the method does not provide detailed calculating and the system of selection of system parameters.
Summary of the invention
Object of the present invention is exactly in order to address the above problem, a kind of multiterminal flexible DC power transmission system coordination control method based on improving decline regulating characteristics is provided, to current conversion station, the senior control strategy based on local controller designs the method, guarantee DC voltage control and the active power balance of multiterminal flexible DC power transmission system under normal operation, abnormal running and fault condition, and realize seamlessly transitting of system running state.
To achieve these goals, the present invention adopts following technical scheme:
A multiterminal flexible DC power transmission system coordination control method, described DC transmission system at least comprises leading current conversion station, assist exchanging circuit station and active power control current conversion station; Described leading current conversion station is for the control of whole system direct voltage; Assist exchanging circuit station is for the auxiliary control that realizes system direct voltage; Active power is controlled current conversion station for transmitting constant active power to its AC electrical network;
Under nominal situation, described assist exchanging circuit station and leading current conversion station cooperation realize the DC voltage control of multiterminal flexible DC power transmission system jointly; Active power is controlled current conversion station employing and is determined active power control and determine Reactive Power Control;
When leading current conversion station enters current-limit mode or stops transport, assist exchanging circuit station adopts based on improving the DC voltage control of direct voltage-active power decline regulating characteristics and determining Reactive Power Control;
When leading current conversion station and assist exchanging circuit station cannot maintain DC transmission system power-balance, active power is controlled current conversion station and is introduced based on improving the standby control of the control of direct voltage-active power decline regulating characteristics as DC voltage control.
The DC voltage control mode of described assist exchanging circuit station based on improving direct voltage-active power decline regulating characteristics is specially:
When assist exchanging circuit station alternating current-direct current exchange power P fluctuates in [δ, δ] scope, introduce dead band and control; By regulating the direct voltage dead band value U at assist exchanging circuit station
dzsize, can realize with the coordination of leading current conversion station and controlling, realize the optimal load flow of DC network and control; Wherein, δ gets 0～0.02p.u.;
If the direct voltage reference value at assist exchanging circuit station is U
dcref,
DC voltage value when assist exchanging circuit station is greater than (U
dcref-U
dz) and be less than (U
dcref+ U
dz) time, assist exchanging circuit station is 0 to the direct current power of DC side feed-in; Now, the operational mode at assist exchanging circuit station is STATCOM pattern;
Direct voltage when assist exchanging circuit station is less than (U
dcref-U
dz) or be greater than (U
dcref+ U
dz) time, the slope that assist exchanging circuit station enters based on direct voltage-active power is k
assdecline control model, realize that having of direct voltage is poor to be controlled;
Maximum direct voltage limit value U when direct voltage is greater than assist exchanging circuit station and normally moves
dcmor the minimum direct current voltage limit value U when being less than assist exchanging circuit station and normally moving
dcntime, assist exchanging circuit station enters current-limit mode, runs on abnormal running pattern.
The described direct voltage reference value U that chooses assist exchanging circuit station
dcrefdirect voltage dead band value U with assist exchanging circuit station
dzaccording to being:
(1) direct voltage reference value U
dcrefshould get leading current conversion station direct voltage command value;
(2) dead band voltage U
dzshould guarantee to avoid the zero crossing in active power to produce vibration.
Described assist exchanging circuit station enters the slope value k of the decline control model based on direct voltage
asschoosing method be:
(1) guarantee that the DC voltage value of each current conversion station of DC transmission system under each operating mode is not out-of-limit, and leave certain margin of safety;
(2) under assurance stable situation, the active power fluctuation range at assist exchanging circuit station is 0.5%～5%, i.e. slope value k
assbe less than k
%P, k
%Pcontrol characteristic slope of a curve value when being output as specified active power and active power value and fluctuating in 0.5%～5% scope for assist exchanging circuit station;
(3) under the enough operating mode of total change of current capacity at minimax operational mode, leading current conversion station and assist exchanging circuit station, slope value k
asschoose and should guarantee that leading current conversion station does not enter current-limit mode;
(4) slope value k
assbe less than min{k
eqM, k
eqN, k
eqM, k
eqNbe respectively under maximum, minimum operational mode assist exchanging circuit station control characteristic slope of a curve value when leading current conversion station enters current-limit mode prior to assist exchanging circuit station just.
Described active power is controlled the DC voltage control of current conversion station based on improving direct voltage-active power decline regulating characteristics and is specially:
During normal operation, active power is controlled current conversion station and is transmitted constant active power value, and its operating voltage range is [U
dcm, U
dcn];
When the leading current conversion station of direct current system and assist exchanging circuit station cannot maintain system power balance, the direct voltage of all current conversion stations exceeds normal range of operation;
When active power, control current conversion station direct voltage and be greater than maximum direct voltage limit value U under active power control current conversion station nominal situation
dcmor be less than active power and control minimum direct current voltage limit value U under current conversion station nominal situation
dcntime, the slope that active power control current conversion station enters based on direct voltage-active power is k
apcdecline control model, get involved the DC voltage control of direct current system;
When direct voltage is greater than the maximum direct voltage limit value U of slope characteristics section under decline control model
dcMor be less than the minimum direct current voltage limit value U of slope characteristics section under decline control model
dcNtime, active power is controlled current conversion station and is entered current-limit mode, restriction active power and active current value.
Described active power is controlled maximum, the minimum direct current voltage U of current conversion station nominal situation
dcm, U
dcnchoose and depend on that active power controls the DC voltage value of current conversion station under maximum, minimum operational mode, and leave certain nargin.
Described active power is controlled the slope k that current conversion station declines and controls
apcchoosing method be:
(1) under assurance damage, the direct voltage of each current conversion station of DC transmission system is not out-of-limit, and leaves certain margin of safety;
(2) under assurance stable situation, the active power fluctuation range at assist exchanging circuit station is 0.5%～5%, i.e. slope value k
assbe less than k
%P, k
%Pcontrol characteristic slope of a curve value when being output as specified active power and active power value and fluctuating in 0.5%～5% scope for assist exchanging circuit station.
The present invention has completed a kind of multiterminal flexible DC power transmission system coordination control strategy based on improving decline regulating characteristics, based on improving direct voltage-active power decline regulating characteristics, the improvement decline control strategy at assist exchanging circuit station and the improvement control strategy that active power is controlled current conversion station have been provided, analyzed the mode of operation of two current conversion stations, according to the trend of DC network, distributed and minimax operational mode has provided the foundation that assist exchanging circuit station and active power are controlled the selection of current conversion station parameter.
Beneficial effect of the present invention:
1. the present invention is for the design of multiterminal flexible DC power transmission system coordination control strategy in the grid-connected situation of large-scale wind power, the perfect hierarchy of control of multiterminal flexible DC power transmission system, controls current conversion station for assist exchanging circuit station and active power and realizes its control strategy based on improving decline regulating characteristics.
2. the present invention distributes for the DC voltage control between each current conversion station of multiterminal flexible DC power transmission system under any operating condition and active power, guarantees multiterminal flexible DC power transmission system seamlessly transitting between each running status.
3. the present invention is for having provided the improvement decline control strategy at assist exchanging circuit station and the improvement control strategy that active power is controlled current conversion station based on improving direct voltage-active power decline regulating characteristics, analyzed the mode of operation of two current conversion stations, according to the trend of DC network, distributed and minimax operational mode has provided the foundation that assist exchanging circuit station and active power are controlled the selection of current conversion station parameter.
Accompanying drawing explanation
Fig. 1 is improvement direct voltage-active power decline regulating characteristics at assist exchanging circuit station;
Fig. 2 (a) is the improvement direct voltage-active power decline regulating characteristics under active power control current conversion station bidirectional power operational mode;
Fig. 2 (b) is the improvement direct voltage-active power decline regulating characteristics under active power control current conversion station unidirectional power operational mode;
Fig. 3 is the safe range reference diagram of the slope characteristics slope over 10 at assist exchanging circuit station;
Fig. 4 (a) is the safe range reference diagram of slope characteristics slope over 10 under active power control current conversion station bidirectional power operational mode;
Fig. 4 (b) is the safe range reference diagram of slope characteristics slope over 10 under active power control current conversion station unidirectional power operational mode;
Fig. 5 is the control system schematic diagram at assist exchanging circuit station;
Fig. 6 is the control system schematic diagram of APC current conversion station.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
A multiterminal flexible DC power transmission system coordination control method based on improving decline regulating characteristics, comprises that leading current conversion station, wind energy turbine set current conversion station, assist exchanging circuit station and active power controls the control strategy of each current conversion stations such as (APC) current conversion station;
Each current conversion station adopts the senior control strategy based on local controller; Leading current conversion station is responsible for the control of direct voltage, adopts constant DC voltage control and determines Reactive Power Control strategy; Wind energy turbine set current conversion station is responsible for collecting the active power of wind farm group, and proportion is controlled and alternating voltage is controlled; The auxiliary DC voltage control of realizing in assist exchanging circuit station, adopts with the DC voltage control of falling characteristic and determines Reactive Power Control strategy; Active power is controlled current conversion station for transmitting constant active power to its AC electrical network, adopt and determine active power control and determine Reactive Power Control strategy, and introduce based on improving the standby control of the control strategy of direct voltage-active power decline regulating characteristics as DC voltage control;
Circular current decoupling controller in the converter of each current conversion station adopts; Interior circular current is controlled and is adopted current feedback and voltage feed-forward control, to improve the tracking individual features of current controller; Current inner loop controller adopts pi regulator to eliminate the steady-state error of current tracking; Each current conversion station adopts vector control and pulse modulation (PWM) technology, to realize quick independent control meritorious and reactive power.
First as follows to each parameter declaration:
U
dcnminimum direct current voltage limit value during for the normal long-play in assist exchanging circuit station, U
dcmmaximum direct voltage limit value during for the normal long-play in assist exchanging circuit station, 2U
dzfor the dead band voltage at assist exchanging circuit station, U
dcreffor the direct voltage reference value at assist exchanging circuit station, P
mAXfor the maximum active power limit value at assist exchanging circuit station, P
mINfor the minimum active power limit value at assist exchanging circuit station, k
assfor the slope that assist exchanging circuit station declines and controls, U
dcNfor the minimum direct current voltage limit value of bidirectional power operational mode under active power control current conversion station damage, U
dcMfor the maximum direct voltage limit value of bidirectional power operational mode under active power control current conversion station damage, U
dcn1for the minimum direct current voltage limit value of bidirectional power operational mode under active power control current conversion station normal operation, U
dcm1for the maximum direct voltage limit value of bidirectional power operational mode under active power control current conversion station normal operation, P
reffor active power is controlled the AC active power reference value that current conversion station flows into DC network, P
mIN1for active power is controlled the minimum active power limit under current conversion station bidirectional power operational mode, P
mAX1for active power is controlled the maximum active power limit under current conversion station bidirectional power operational mode, k
apcfor active power is controlled the slope that current conversion station bidirectional power operational mode declines and controls, U
dcN1for the minimum direct current voltage limit value of unidirectional power mode of operation under active power control current conversion station damage, U
dcM1for the maximum direct voltage limit value of unidirectional power mode of operation under active power control current conversion station damage, U
dcn2for the minimum direct current voltage limit value of unidirectional power mode of operation under active power control current conversion station normal operation, U
dcm2for the maximum direct voltage limit value of unidirectional power mode of operation under active power control current conversion station normal operation, P
mAX2for active power is controlled the maximum active power limit under current conversion station unidirectional power operational mode, P
mIN2for active power is controlled the minimum active power limit under current conversion station unidirectional power operational mode, k
apc1for active power is controlled the slope that current conversion station unidirectional power operational mode declines and controls.
As shown in Figure 1, out-of-limit for preventing the active power at assist exchanging circuit station, in the characteristic curve at this assist exchanging circuit station, introduce the threshold limit value U of active power
dcmwith minimum limit value U
dcn.This group limit value U
dcmand U
dcnwith the flow restricter acting in conjunction in vector control strategy, prevent that converter from causing damage because running on overload to equipment.
When assist exchanging circuit station alternating current-direct current exchange power P fluctuates in [δ, δ] (δ gets 0～0.02p.u.) scope, for preventing that active power value P from vibrating, simultaneously more reasonable for DC power flow is distributed, controller is introduced dead band and is controlled.By regulating direct voltage dead band value U
dzsize, can realize with the coordination of leading current conversion station and controlling, realize the optimal load flow of DC network and control.
There are three kinds of control models at assist exchanging circuit station: (1) STATCOM pattern: when direct voltage is greater than (U
dcref-U
dz) and be less than (U
dcref+ U
dz) time, assist exchanging circuit station is 0 to the direct current power of DC side feed-in, now, operational mode and the STATCOM at assist exchanging circuit station are similar, be mainly AC electrical network dynamic reactive voltage support is provided; (2) decline control model (normal operation mode): when direct voltage is less than (U
dcref-U
dz) or be greater than (U
dcref+ U
dz) time, the slope that current conversion station enters based on direct voltage is k
assdecline control model, realize that having of direct voltage is poor to be controlled.Above two kinds of operational modes are the normal operation mode of auxiliary station; (3) current-limit mode: when direct voltage is greater than U
dcmor be less than U
dcntime, auxiliary station enters current-limit mode, runs on abnormal running pattern.Based on vector control and pulse modulation technique, the control system schematic diagram of sub-control station as shown in Figure 5.Current conversion station DC voltage is through single order low-pass filtering link, via U
dc-P characteristic curve obtains active power reference value P
ref.
The reference voltage U at assist exchanging circuit station
dcrefu with dead band voltage
dzdetermined the startup of falling controller, the startup DC voltage value of assist exchanging circuit station slope characteristics section is U
dcref+ U
dz, its basis for selecting is:
(1) direct voltage reference value U
dcrefshould get the leading stream voltage instruction value of standing erectly;
(2) dead band voltage U
dzshould guarantee to avoid the vibration in the generation of active power zero crossing.
Determined U
dcref, U
dzafterwards, assist exchanging circuit station slope characteristics slope over 10 k
asswith converter active power limit value P
mAX, P
mINdetermined U
dcm, U
dcnsize, thereby determined power stage under decline control model size and direct voltage scope.
Slope k
asssystem of selection as follows:
(1) according to guaranteeing each current conversion station of DC transmission system DC voltage value out-of-limit selection not under each operating mode, and leave certain margin of safety, in Fig. 3, shadow region is the k that can guarantee direct voltage safety
assscope;
(2) under assurance stable situation, the active power fluctuation range at assist exchanging circuit station is 0.5%～5%, i.e. slope value k
assbe less than k
%P, k
%Pcontrol characteristic slope of a curve value when being output as specified active power and active power value and fluctuating in 0.5%～5% scope for assist exchanging circuit station;
(3) under the enough operating mode of total change of current capacity of minimax operational mode, leading Zhan He auxiliary station, this parameter selects to guarantee that leading station does not enter current-limit mode; Characteristic curve slope value k
assbe less than min{k
eqM, k
eqN, k
eqM, k
eqNbe respectively leading assist exchanging circuit station control slope value of standing while just entering current-limit mode prior to assist exchanging circuit station under maximum, minimum operational mode.
As shown in Figure 2; when the large disturbances such as grid side voltage falls for a long time, change of current fault of stop occur; the active power transmission at leading current conversion station or assist exchanging circuit station is restricted; cause direct current system cannot continue to maintain its active power balance; thereby direct voltage is out of hand, final current conversion station is because protecting action out of service.Active power is controlled the standby station that current conversion station is designed to DC voltage control, introduces slope and controls as the control strategy under damage.
Improvement direct voltage-active power decline regulating characteristics of active power control current conversion station as shown in Figure 2, comprises the operational mode and two kinds of the operational modes that allows unidirectional power to transmit that allow bidirectional power transmission.Bidirectional power pattern allows current conversion station further rising with inhibition DC voltage by reverse transfer active power under abnormal operation condition, its for maintain direct voltage with capacity apparently higher than unidirectional power operational mode, but simultaneously, active power vacancy in power switching process has proposed certain requirement to the peak modulation capacity of APC current conversion station AC system, therefore this kind of control model is applicable to the APC current conversion station being connected with the medium-and-large-sized electric power system with enough stand-by heat capacity.One-way transmission power mode does not allow meritorious trend upset, is applicable to the APC current conversion station being connected with small electrical system.
Take bidirectional power operational mode as example:
Active power is controlled current conversion station three kinds of control models:
(1) determine active power and control (normal operation mode): while normally moving, active power is controlled current conversion station and transmitted constant active power value, and its operating voltage range is [U
dcm1, U
dcn1];
(2) decline control model: when the leading Zhan He of direct current system auxiliary station cannot maintain system power balance, each current conversion station direct voltage exceeds normal range of operation; When active power, control current conversion station direct voltage and be greater than U
dcm1or be less than U
dcn1time, the slope that active power control current conversion station enters based on direct voltage-active power is k
apcdecline control model, get involved the DC voltage control of direct current system;
(3) current-limit mode: when direct voltage is greater than U
dcMor be less than U
dcNtime, active power is controlled current conversion station and is entered current-limit mode, restriction active power and active current value.Based on vector control and pulse modulation technique, the control system schematic diagram of APC current conversion station as shown in Figure 6.Current conversion station DC voltage is through single order low-pass filtering link, via U
dc-P characteristic curve obtains the correction value P of active power reference value
delta, by P
deltawith original active power reference value P
refand as revised active power reference value.
Active power is controlled the minimax direct voltage U of current conversion station nominal situation
dcm1, U
dcn1determined the startup of falling controller, choosing of this class value depends primarily on the DC voltage value of active power control current conversion station under minimax operational mode, and should leave certain nargin.
As parameter U
dcm1, U
dcn1after determining, active power is controlled the slope k that current conversion station declines and controls
apcwith active power limit P
mAX1, P
mIN1jointly determined U
dcM, U
dcNsize, thereby determined the output of active power under decline control model and direct voltage range of operation.Slope k
apcsystem of selection as follows:
(1) direct voltage that guarantees each current conversion station of DC transmission system under damage is out-of-limit selection not, and leaves certain margin of safety, as shadow region in Fig. 4 is the k that can guarantee direct voltage safety
apcscope;
(2) under assurance stable situation, the active power fluctuation range at assist exchanging circuit station is 0.5%～5%, i.e. slope value k
assbe less than k
%P, k
%Pcontrol characteristic slope of a curve value when being output as specified active power and active power value and fluctuating in 0.5%～5% scope for assist exchanging circuit station.
Although above-mentioned, by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (7)
1. a multiterminal flexible DC power transmission system coordination control method, described DC transmission system at least comprises that leading current conversion station, assist exchanging circuit station and active power controls current conversion station; Described leading current conversion station is for the control of whole system direct voltage; Assist exchanging circuit station is for the auxiliary control that realizes system direct voltage; Active power is controlled current conversion station for transmitting constant active power to its AC electrical network; It is characterized in that,
Under nominal situation, described assist exchanging circuit station and leading current conversion station cooperation realize the DC voltage control of multiterminal flexible DC power transmission system jointly; Active power is controlled current conversion station employing and is determined active power control and determine Reactive Power Control;
When leading current conversion station enters current-limit mode or stops transport, assist exchanging circuit station adopts based on improving the DC voltage control of direct voltage-active power decline regulating characteristics and determining Reactive Power Control;
When leading current conversion station and assist exchanging circuit station cannot maintain DC transmission system power-balance, active power is controlled current conversion station and is introduced based on improving the standby control of the control of direct voltage-active power decline regulating characteristics as DC voltage control.
2. a kind of multiterminal flexible DC power transmission system coordination control method as claimed in claim 1, is characterized in that, the DC voltage control mode of described assist exchanging circuit station based on improving direct voltage-active power decline regulating characteristics is specially:
When assist exchanging circuit station alternating current-direct current exchange power P fluctuates in [δ, δ] scope, introduce dead band and control; By regulating the direct voltage dead band value U at assist exchanging circuit station
dzsize, can realize with the coordination of leading current conversion station and controlling, realize the optimal load flow of DC network and control; Wherein, δ gets 0～0.02p.u.;
If the direct voltage reference value at assist exchanging circuit station is U
dcref,
DC voltage value when assist exchanging circuit station is greater than (U
dcref-U
dz) and be less than (U
dcref+ U
dz) time, assist exchanging circuit station is 0 to the direct current power of DC side feed-in; Now, the operational mode at assist exchanging circuit station is STATCOM pattern;
Direct voltage when assist exchanging circuit station is less than (U
dcref-U
dz) or be greater than (U
dcref+ U
dz) time, the slope that assist exchanging circuit station enters based on direct voltage-active power is k
assdecline control model, realize that having of direct voltage is poor to be controlled;
Maximum direct voltage limit value U when direct voltage is greater than assist exchanging circuit station and normally moves
dcmor the minimum direct current voltage limit value U when being less than assist exchanging circuit station and normally moving
dcntime, assist exchanging circuit station enters current-limit mode, runs on abnormal running pattern.
3. a kind of multiterminal flexible DC power transmission system coordination control method as claimed in claim 2, is characterized in that, described in choose the direct voltage reference value U at assist exchanging circuit station
dcrefdirect voltage dead band value U with assist exchanging circuit station
dzaccording to being:
(1) direct voltage reference value U
dcrefshould get leading current conversion station direct voltage command value;
(2) dead band voltage U
dzshould guarantee to avoid the zero crossing in active power to produce vibration.
4. a kind of multiterminal flexible DC power transmission system coordination control method as claimed in claim 2, is characterized in that, described assist exchanging circuit station enters the slope value k of the decline control model based on direct voltage
asschoosing method be:
(1) guarantee that the DC voltage value of each current conversion station of DC transmission system under each operating mode is not out-of-limit, and leave certain margin of safety;
(2) under assurance stable situation, the active power fluctuation range at assist exchanging circuit station is 0.5%～5%, i.e. slope value k
assbe less than k
%P, k
%Pcontrol characteristic slope of a curve value when being output as specified active power and active power value and fluctuating in 0.5%～5% scope for assist exchanging circuit station;
(3) under the enough operating mode of total change of current capacity at minimax operational mode, leading current conversion station and assist exchanging circuit station, slope value k
asschoose and should guarantee that leading current conversion station does not enter current-limit mode;
(4) slope value k
assbe less than min{k
eqM, k
eqN, k
eqM, k
eqNbe respectively under maximum, minimum operational mode assist exchanging circuit station control characteristic slope of a curve value when leading current conversion station enters current-limit mode prior to assist exchanging circuit station just.
5. a kind of multiterminal flexible DC power transmission system coordination control method as claimed in claim 1, is characterized in that, described active power is controlled the DC voltage control of current conversion station based on improving direct voltage-active power decline regulating characteristics and is specially:
During normal operation, active power is controlled current conversion station and is transmitted constant active power value, and its operating voltage range is [U
dcm, U
dcn];
When the leading current conversion station of direct current system and assist exchanging circuit station cannot maintain system power balance, the direct voltage of all current conversion stations exceeds normal range of operation;
When active power, control current conversion station direct voltage and be greater than maximum direct voltage limit value U under active power control current conversion station nominal situation
dcmor be less than active power and control minimum direct current voltage limit value U under current conversion station nominal situation
dcntime, the slope that active power control current conversion station enters based on direct voltage-active power is k
apcdecline control model, get involved the DC voltage control of direct current system;
When direct voltage is greater than the maximum direct voltage limit value U of slope characteristics section under decline control model
dcMor be less than the minimum direct current voltage limit value U of slope characteristics section under decline control model
dcNtime, active power is controlled current conversion station and is entered current-limit mode, restriction active power and active current value.
6. a kind of multiterminal flexible DC power transmission system coordination control method as claimed in claim 5, is characterized in that, described active power is controlled maximum, the minimum direct current voltage U of current conversion station nominal situation
dcm, U
dcnchoose and depend on that active power controls the DC voltage value of current conversion station under maximum, minimum operational mode, and leave certain nargin.
7. a kind of multiterminal flexible DC power transmission system coordination control method as claimed in claim 5, is characterized in that, described active power is controlled the slope k that current conversion station declines and controls
apcchoosing method be:
(1) under assurance damage, the direct voltage of each current conversion station of DC transmission system is not out-of-limit, and leaves certain margin of safety;
(2) under assurance stable situation, the active power fluctuation range at assist exchanging circuit station is 0.5%～5%, i.e. slope value k
assbe less than k
%P, k
%Pcontrol characteristic slope of a curve value when being output as specified active power and active power value and fluctuating in 0.5%～5% scope for assist exchanging circuit station.
Priority Applications (1)
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|---|---|---|---|
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| CN108923448A (en) * | 2018-06-19 | 2018-11-30 | 东南大学 | A kind of Multi-end flexible direct current transmission control method for coordinating and system |
| CN109347111A (en) * | 2018-10-22 | 2019-02-15 | 国网山东省电力公司济南供电公司 | A kind of flexible direct current converter station active reactive control method considering voltage change ratio |
| CN109428341A (en) * | 2017-09-05 | 2019-03-05 | 南京南瑞继保电气有限公司 | A kind of DC voltage control method for coordinating |
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| CN110492520A (en) * | 2019-08-21 | 2019-11-22 | 国网山西省电力公司电力科学研究院 | DC voltage slop control strategy based on inverter capacity and adjustment speed |
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