CN109995088A - A kind of extensive renewable energy access Power system security control method - Google Patents
A kind of extensive renewable energy access Power system security control method Download PDFInfo
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- CN109995088A CN109995088A CN201910031793.6A CN201910031793A CN109995088A CN 109995088 A CN109995088 A CN 109995088A CN 201910031793 A CN201910031793 A CN 201910031793A CN 109995088 A CN109995088 A CN 109995088A
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
-
- 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of, and the extensive renewable energy based on node weighted factor accesses Power system security control method, comprising: determines the heavy-haul line filtered out and trend-active power sensitivity matrix, voltage-active power sensitivity matrix close to voltage limits node；The weighted factor for determining control node filters out ideal control node combination；The adjusting sequence and capacity for providing control object, formulate extensive renewable energy access Power system security control scheme.
Description
Technical field
The invention belongs to extensive renewable energy to access Power system security control technical field, more particularly to a kind of based on section
The extensive renewable energy of point weighted factor accesses Power system security control method.
Background technique
As wind power base concentrates greatly improving for access capacity, the access of extensive renewable energy in power grid so that save
There is substantially frequent fluctuation in point voltage, and the automatic voltage regulation measure that voltage fluctuation is enable to respond quickly in voltage control easily reaches
To the adjusting upper limit.Therefore, in improving renewable energy consumption horizontal process, it need to avoid adjusting to system voltage and cause excessive shadow
It rings.
Optimization planning class is compared without iteration, without convergence problem, convenient for operation based on sensitivity method of controlling security
Implement.In terms of previous research is mainly concentrated in meter sensitivity, according to sensitivity order of magnitude to control node into
Row selection has ignored influence of the same power injection node to different branch trend and remaining node voltage, and according to sensitivity
Order of magnitude arrangement control unit output often lead to system power imbalance and node voltage it is out-of-limit.
The extensive renewable energy access Power system security control method that therefore, it is necessary to a kind of based on node weighted factor come
Solve the problems, such as that the voltage of renewable energy access power grid fluctuates widely.
Summary of the invention
In view of the deficiencies of the prior art, the object of the present invention is to provide it is a kind of can be again based on the extensive of node weighted factor
The raw energy accesses Power system security control method, for solving the problems, such as that the voltage during renewable energy consumption fluctuates widely,
Establish the adjusting sequence and capacity of control object, it is intended to carry out taking into account the shadow to system voltage while renewable energy consumption
It rings.
A kind of extensive renewable energy access Power system security control method based on node weighted factor, including following step
It is rapid:
S1: obtaining electrical network basic data, carries out the whole network Load flow calculation；
S2: screening heavy-haul line and (branch circuit load rate screens threshold value and voltage screening threshold value can close to voltage limits node
It sets as the case may be)；
S3: for the heavy-haul line filtered out and close to voltage limits node, trend-active power sensitivity square is calculated
Battle array, voltage-active power sensitivity matrix；
S4: it calculates, and sorts according to the weighted factor that node weighted factor calculation formula carries out control node one by one；
S5: ideal control node is filtered out according to node weighted factor and is combined；
S6: in conjunction with renewable energy control characteristic, high energy load model and node weighted factor sequence, lotus-net-is formulated
Source active power coordination control strategy.
Preferably, the S3 the following steps are included:
S301: trend-active power sensitivity matrix is established.Branch Power Flow is the function about node voltage and phase angle,
It is simultaneously also the function of each node injecting power.By level-one Taylor series expansion, and be converted to matrix form.Ignore node injection
Influence of the reactive power to branch active power flow only considers influence of the node injection active power to Branch Power Flow, then
Sensitivity formula to branch active power about node injecting power；
S302: voltage-active power sensitivity matrix is established.Node trend equilibrium equation considers that Static Load voltage is special
Property, traditional Jacobian matrix is extended to broad sense Jacobian matrix, inverts to obtain the voltage spirit for considering Load static voltage characteristic
Sensitive matrix.
Preferably, the S4 the following steps are included:
S401: Branch Power Flow weight factor and node voltage weight factor are calculated.Branch Power Flow weight factor is because of consumption
The ratio between heavy-haul line set weight factor and normal set of fingers weight factor that renewable energy generates；Node voltage weight because
Son for because consumption renewable energy generate close to voltage limits or out-of-limit node set weight factor and normal voltage node collection
Close the ratio between weight factor；
S402: calculate node weighted factor.Node weighted factor is Branch Power Flow, node voltage weight factor per unit value adds
Quan He.
Technical solution of the present invention has the advantages that
A kind of extensive renewable energy based on node weighted factor provided by the invention accesses Power system security control side
Method establishes control object by establishing based on trend-active power sensitivity, voltage-active power sensitivity nodal method
Adjusting sequence and capacity, for renewable energy consumption scheme implementation guidance is provided.
Detailed description of the invention
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Fig. 1 is a kind of process of extensive renewable energy access Power system security control method based on node weighted factor
Figure；
Fig. 2 is the regional power grid schematic diagram containing large-scale wind power and high energy load.
Fig. 3 heavy duty branch node weighting control and lotus-net-source active power coordinated control simulation result comparison diagram；
Fig. 4 busbar voltage node weighting control and lotus-net-source active power coordinated control simulation result comparison diagram；
Specific embodiment
In order to have a clear understanding of technical solution of the present invention, its detailed structure will be set forth in the description that follows.Obviously, originally
The specific execution of inventive embodiments is not limited to the specific details that those skilled in the art is familiar with.Preferred reality of the invention
It applies example to be described in detail as follows, in addition to these embodiments of detailed description, can also have other embodiments.
The present invention is described in further details with reference to the accompanying drawings and examples.
Embodiment 1
Fig. 1 is a kind of process of extensive renewable energy access Power system security control method based on node weighted factor
Figure.In Fig. 1, a kind of extensive renewable energy access Power system security control side based on node weighted factor provided by the invention
Method includes:
S1: obtaining electrical network basic data, carries out the whole network Load flow calculation.
S2: screening heavy-haul line and (branch circuit load rate screens threshold value and voltage screening threshold value can close to voltage limits node
It sets as the case may be)；
S3: for the heavy-haul line filtered out and close to voltage limits node, trend-active power sensitivity square is calculated
Battle array, voltage-active power sensitivity matrix；
S4: it calculates, and sorts according to the weighted factor that node weighted factor calculation formula carries out control node one by one；
S5: ideal control node is filtered out according to node voltage weight factor and is combined；
S6: in conjunction with renewable energy control characteristic, high energy load model and node weighted factor sequence, lotus-net-is formulated
Source active power coordination control strategy.
Preferably, the S3 the following steps are included:
S301: trend-active power sensitivity matrix is established
In formula, PlFor the trend of branch l；PkFor node k injecting power；Ui, UjFor node i, j voltage；θi, θjRespectively save
Point i, j voltage phase angle.
S302: voltage-active power sensitivity matrix is established
The State characteristics of load refer between the active power, reactive power and system voltage, frequency of its consumption
Functional dependencies.Consider that the static load characteristic model of voltage influence is often indicated with quadratic function form, as shown in formula (2).
Wherein, PLN、QLNRespectively voltage rating UNActive power, reactive power load value under horizontal；a1、b1For constant-resistance
Ratio shared by anti-load；a2、b2For ratio shared by constant current load；a3、b3For ratio shared by constant power load model.
Consider Load static voltage characteristic, traditional Jacobian matrix can be extended are as follows:
Wherein,WithRespectively node load is to voltage phase angle, amplitude
Local derviation,
Δ θ in formula, Δ V are respectively voltage phase angle and amplitude, and Δ P, Δ Q are respectively the weighting variation of node injecting power node
Amount, S are the voltage sensibility matrix for considering Load static voltage characteristic.
The sensitivity relation of voltage -- active power are as follows:
Δ U=S21ΔP (5)
Wherein, S21For the active power sensitivity matrix of voltage.
Preferably, the S4 the following steps are included:
S401: Branch Power Flow weight factor and node voltage weight factor are calculated:
In formula: Wcl、WcuFor Branch Power Flow, node voltage weight factor；Wcl、WcuFor Branch Power Flow, node voltage weight because
Sub- per unit value；For Branch Power Flow, node voltage weight factor maximum value；For because consumption can
Heavy-haul line set that the renewable sources of energy generate, close to voltage limits node set weight factor；For normal set of fingers power
Repeated factor,For normal voltage node set weight factor, whereinFor trend-active power spirit of kth branch
Sensitivity,For voltage-active power sensitivity of k-th of node,Indicate kth branch in normal set of fingers
The ratio of active power nargin and rated capacity,Indicate the voltage margin of k-th of node and the ratio of voltage rating；Indicate trend sensitivity of the control node c to easy heavy-haul line l, it is general to choose absolute value the larger value；ML、MUIndicate heavy duty
Line set, close to the total quantity of voltage limits node set；NL、NUIndicate the sum of normal set of fingers, normal node set
Amount.
S402: calculate node weighted factor:
Wcontrol=λ1|Wcl|+λ2|Wcu| (14)
λ1+λ2=1 (15)
Embodiment 2:
Fig. 2 is the regional power grid schematic diagram containing large-scale wind power and high energy load, and as example, the present invention is provided
It is a kind of based on node weighted factor extensive renewable energy access Power system security control method include:
S1: obtaining electrical network basic data, carries out the whole network Load flow calculation；
S2: screening heavy-haul line and (branch circuit load rate screens threshold value and voltage screening threshold value can close to voltage limits node
It sets as the case may be)；
Branch circuit load rate is set and screens threshold value δ0=3.5, obtain line set Lcou={ Yumen the Jiayu Pass 330- 330；It is beautiful
Door 330- clear spring 330；Sweet Jiuquan 31 quintar 330- }.According to branch circuit load rate δijWith circuit end points i, j voltage difference UijSymbol
Classify to the route in line set L, obtains route subset It willIt controls and gathers as route.
It willEndpoint node be classified as node control subset；U is setset=2, with UsetIt is horizontal position from Load flow calculation knot
U is filtered out in fruituplimit-|Ui|≤UsetAndNode, U in formulauplimit, UlowlimitFor node
Voltage bound, μ, σ are respectively the mean value and variance of all node voltages, obtain node control set Ncon={ quintar 330；Wine
Steel aluminium manufacturer 330 }.
S3: for the heavy-haul line filtered out and close to voltage limits node, trend-active power sensitivity square is calculated
Battle array, voltage-active power sensitivity matrix；
Each active power controller object sensitivity is calculated according to formula (1), formula (5), as shown in table 2.
Each active power controller object sensitivity of table 2
S4: λ is taken1=0.8, λ2=0.2, control node weighted factor is carried out one by one according to node weighted factor calculation formula
It calculates, and sorts；
Each active power controller object weighted factor is calculated according to formula (6) to formula (13), and is arranged by ascending sequence, such as
Shown in table 3.
Each active power controller object weighted factor of table 3
S5: ideal control node is filtered out according to node weighted factor and is combined；
According to the weighted factor size being calculated, adjusting sequence is followed successively by normal power supplies, high energy load, wind-light-electricity
?.
S6: in conjunction with renewable energy control characteristic, high energy load model and node weighted factor sequence, lotus-net-is formulated
Source active power coordination control strategy.
S601: normal power supplies are adjusted:
Normal power supplies weighted factor is less than high energy load, should preferentially adjust.Model is adjusted according to normal power supplies, is calculated
To normal power supplies control plan, the results are shown in Table 4.
4 each normal power supplies regulated quantity (unit: MW) of table
| Normal power supplies | Jiuquan thermoelectricity | Zhangye power plant | Jinchang power plant | Jinchuan power plant |
| Regulated quantity | 234 | 63 | 65 | 145 |
The total regulated quantity 507MW of normal power supplies, residue wind-light-electricity increment nargin is 618.27MW- after normal power supplies are adjusted
507MW=111.27MW.
S602: high energy Load Regulation:
It is ascending according to weighted factor according to the available each high energy Load Regulation ability of high energy Load Regulation model
Order-assigned high energy Load Regulation demand, the results are shown in Table 5.
5 high energy Load Regulation demand (unit: MW) of table
S603: each honourable electric field regulation scheme a few days ago is determined:
According to electricity in model optimize as a result, determine total wind-light-electricity power increment, it is ascending according to weighted factor
Total power increment is distributed to each honourable electric field by sequence, and obtaining each honourable electric field, regulation scheme is as shown in table 6 a few days ago.
Each honourable electric field in 6 west of a river of table regulation scheme (unit: MW) a few days ago
Node weighted factor control method and the lotus-net-source active power control method for coordinating for not considering weighted factor are imitative
True Comparative result is as shown in table 7.Heavily loaded branch node weighting control and lotus-net-source active power coordinated control simulation result pair
It is more as shown in Figure 3 than scheming.Busbar voltage node weighting control and lotus-net-source active power coordinated control simulation result comparison diagram are such as
Shown in Fig. 4.
7 node of table weighting control is compared with lotus-net-source active power coordinated control simulation result
It is obstructed electricity for consumption wind-light-electricity, the heavy-haul line load factor under active power coordinated control control method substantially mentions
There is the out-of-limit situation of busbar voltage in height, 330 bus of quintar.Compared to active power control method for coordinating, the control of node weighted factor
Heavy-haul line load factor under method reduces, while being greatly reduced close to voltage limits busbar voltage, no out-of-limit feelings of busbar voltage
Condition.Demonstrating node weighted factor control method can take into account while dissolving renewable energy to branch circuit load rate and node
The validity of the influence of voltage.In short, be obstructed under the maximum target of electricity in consumption renewable energy, the control of node weighted factor
Method can slow down the trend that branch is heavily loaded, node voltage is out-of-limit.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail referring to above-described embodiment for pipe, and those of ordinary skill in the art still can be to this hair
Bright specific embodiment is modified or replaced equivalently, these without departing from spirit and scope of the invention any modification or
Equivalent replacement is being applied within pending claims.
Claims (5)
1. a kind of extensive renewable energy based on node weighted factor accesses Power system security control method, which is characterized in that
Extensive renewable energy access Power system security control method the following steps are included:
S1: obtaining electrical network basic data, carries out the whole network Load flow calculation；
S2: (branch circuit load rate screens threshold value and voltage screening threshold value can root for the heavily loaded branch of screening and the node close to voltage limits
It is set according to concrete condition)；
S3: for the heavy-haul line and voltage filtered out close to the node of voltage limits, trend-active power sensitivity is calculated
Matrix, voltage-active power sensitivity matrix；
S4: it calculates, and sorts according to the weighted factor that node weighted factor calculation formula carries out control node one by one；
S5: ideal control node is filtered out according to node weighted factor and is combined；
S6: in conjunction with renewable energy power producing characteristics, high energy load model and node weighted factor sequence, formulating lotus-net-source has
Function power coordination control strategy.
2. a kind of extensive renewable energy based on node weighted factor according to claim 1 accesses power grid security control
Method processed, which is characterized in that the S3 the following steps are included:
S301: trend-active power sensitivity matrix is established；
Branch Power Flow is the function about node voltage and phase angle, while being also the function of each node injecting power；By level-one Thailand
Series expansion is strangled, and is converted to matrix form；Ignore influence of the node injection reactive power to branch active power flow, only examines
Consider influence of the node injection active power to Branch Power Flow, then obtains branch active power to the sensitive of node injection active power
Spend formula；
S302: voltage-active power sensitivity matrix is established；
Node trend equilibrium equation considers Load static voltage characteristic, and traditional Jacobian matrix is extended to broad sense Jacobi square
Battle array inverts to obtain the voltage sensibility matrix for considering Load static voltage characteristic.
3. a kind of extensive renewable energy based on node weighted factor according to claim 1 accesses power grid security control
Method processed, which is characterized in that the S4 the following steps are included:
S401: Branch Power Flow weight factor and node voltage weight factor are calculated；
Branch Power Flow weight factor is the heavy-haul line set weight factor generated by consumption renewable energy and normal branch collection
Close the ratio between weight factor；Node voltage weight factor is to be generated because of consumption renewable energy close to voltage limits or out-of-limit node
Gather the ratio between weight factor and normal voltage node set weight factor；
S402: calculate node weighted factor；
Node weighted factor is the weighted sum of Branch Power Flow weight factor and node voltage weight factor per unit value.
4. a kind of extensive renewable energy based on node weighted factor according to claim 1 accesses power grid security control
Method processed, which is characterized in that the S3 the following steps are included:
S301: trend-active power sensitivity matrix is established
In formula, PlFor the trend of branch l；PkFor node k injecting power；Ui, UjFor node i, j voltage；θi, θjRespectively node i,
J voltage phase angle；
S302: voltage-active power sensitivity matrix is established
The State characteristics of load refer to the function between the active power, reactive power and system voltage, frequency of its consumption
Dependence；Consider that the static load characteristic model of voltage influence is often indicated with quadratic function form, as shown in formula (2)；
Wherein, PLN、QLNRespectively voltage rating UNActive power, reactive power load value under horizontal；a1、b1It is negative for constant-impedance
Ratio shared by lotus；a2、b2For ratio shared by constant current load；a3、b3For ratio shared by constant power load model；
Consider Load static voltage characteristic, traditional Jacobian matrix can be extended are as follows:
Wherein,WithRespectively node load to voltage phase angle, amplitude it is inclined
It leads,
Δ θ in formula, Δ V are respectively voltage phase angle and amplitude, and Δ P, Δ Q are respectively node injecting power node weighting variable quantity, S
For the voltage sensibility matrix for considering Load static voltage characteristic；
Voltage-active power sensitivity relation are as follows:
Δ U=S21ΔP (5)
Wherein, S21For the active power sensitivity matrix of voltage.
5. a kind of extensive renewable energy based on node weighted factor according to claim 1 accesses power grid security control
Method processed, which is characterized in that the S4 the following steps are included:
S401: Branch Power Flow weight factor and node voltage weight factor are calculated:
In formula: Wcl、WcuFor Branch Power Flow, node voltage weight factor；|Wcl|、|Wcu| for Branch Power Flow, node voltage weight because
Sub- per unit value；For Branch Power Flow, node voltage weight factor maximum value；For because consumption can
Heavy-haul line set that the renewable sources of energy generate, close to voltage limits node set weight factor；For normal set of fingers power
Repeated factor,For normal voltage node set weight factor, whereinFor trend-active power spirit of kth branch
Sensitivity,For voltage-active power sensitivity of k-th of node,Indicate kth branch in normal set of fingers
The ratio of active power nargin and rated capacity,Indicate the voltage margin of k-th of node and the ratio of voltage rating；Indicate trend sensitivity of the control node c to easy heavy-haul line l, it is general to choose absolute value the larger value；ML、MUIndicate heavy duty
Line set, close to the total quantity of voltage limits node set；NL、NUIndicate the sum of normal set of fingers, normal node set
Amount；
S402: calculate node weighted factor:
Wcontrol=λ1|Wcl|+λ2|Wcu| (14)
λ1+λ2=1 (15).
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