CN105977992A - Distribution system adjusting reactive power output intelligently based on load change - Google Patents

Abstract

The present invention discloses a distribution system adjusting reactive power output intelligently based on load change. The distribution system adjusting reactive power output intelligently based on load change can identify and track change of system running topological and state intelligently, acquire information about a node voltage, a load, and force being capable of reactively compensated by a branch line, dynamically and intelligently adjust reactive compensation with the information as an information source, and coordinate reactive power injection of all distributed SVC devices, so that voltages of all nodes in a feedback line in the distribution system meet a standard requirement, the distributed SVC devices are coordinated to provide a reactive power support for the distribution system, and the use ratio and economic benefits of the distributed SVC devices are further improved.

Description

A kind of distribution system based on the load change idle output of Intelligent adjustment

Art

The present invention relates to a kind of distribution system based on the load change idle output of Intelligent adjustment.

Background technology

In power system, voltage be weigh the quality of power supply an important indicator, brownout, too high the most not only can shadow The loud life-span to electrical equipment and efficiency, but also the stable and safe operation of entail dangers to power system.Reactive power equilibrium is Ensureing the important means of voltage stabilization, voltage & var control, to reducing network loss, improves quality of voltage and plans as a whole system resource configuration Etc. there being important effect.

Traditional power distribution network uses voltage-reactive control (VQC), and the pressure regulation of transformer station is mainly on-load voltage regulation transformation Device coordinates the switching of Capacitor banks to realize.Along with distributed SVC equipment constantly accesses power distribution network, change conventional electrical distribution net Trend flows to and voltage's distribiuting, and has randomness and intermittent, load has the features such as undulatory property owing to DG exerts oneself, and can lead Mutagens power station busbar voltage is qualified and situation that node voltage of on feeder line is out-of-limit occurs, badly influences the operation control of transformer station System strategy.

Quality of voltage is that power distribution network runs one of index of paying close attention to the most, does not the most save each in current power distribution network Point voltage carries out the means of comprehensive monitoring, and carrying out voltage-regulation is all to carry out in the transformer station powered to power distribution network, or by respectively Load utilizes reactive capacitance compensation to carry out according to respective access point voltage.These voltage-regulation measures are generally difficult to take into account the overall situation Voltage levvl, and lack the method and enforcement means coordinating to control.

At present, the optimization analytical calculation comparative maturity of distribution system, the optimization of real-time voltage power-less is main with control Carried out by EMS, the Real time data acquisition of electrical network is also come from transformer station by RTU (remote-terminal unit) Be acquired and on give the data of EMS.But, on the one hand the voltage and reactive power optimization cycle of bulk power grid generally with A few minutes or even one hour carry out periodic duty for unit, and on the other hand electrical network self is that a load is in dynamic with the generating moment The system of state balance, during real-time voltage power-less control, the state of electrical network has occurred that relative to the section of global optimization Skew.

Summary of the invention

The present invention provides a kind of distribution system based on the load change idle output of Intelligent adjustment, should be based on load change intelligence Can regulate idle output distribution system, can Intelligent Recognition and follow the tracks of system run topological sum state change, obtain node electricity Press, load, the information such as exert oneself of available branch line reactive-load compensation, and regulate reactive-load compensation as information source dynamic and intelligent, coordinate The reactive power of each distributed SVC equipment is injected, it is possible to make each node voltage of feeder line in distribution system meet standard Requirement, coordinating distributed SVC equipment provides reactive power to support to distribution system, further increases distributed SVC equipment Utilization rate and economic benefit.

To achieve these goals, the present invention provides a kind of power distribution system based on the load change idle output of Intelligent adjustment System, this distribution system includes:

Feeder line, this feeder line is multiple, for providing electric energy for multiple loads；

SVC equipment, for providing reactive power, to maintain stablizing of feeder line voltage, this SVC equipment for feeder line For multiple, and with described feeder line one_to_one corresponding；

Grid-connecting apparatus, is used for realizing SVC equipment and feeder line is incorporated into the power networks, this grid-connecting apparatus and described feeder line one One is corresponding；

And supervising device；

This supervising device includes:

The communication bus that monitoring modular, control module communicate with for described each module；

Described monitoring modular, for the actual voltage value of the multiple load access points of monitoring in real time；

Described control module include regulating and controlling judging unit, Optimized model set up unit, reactive power sets acquiring unit and Reactive power sets output unit, wherein:

For distribution system current scheduling period start time, described regulation and control judging unit is made whether that regulation and control judge, bag Including and start at current scheduling period, the voltage that each distributed SVC equipment j uploads corresponding access node to control module respectively has Valid value U_fj, wherein j=1,2 ..., m, monitoring modular uploads voltage effective value U at load node n to control module_n, control module Judge whether U_n<U_lim1, U_lim1The load node voltage effective value lower limit specified for standard, is that then order optimization model is set up Cell operation, otherwise waits for new scheduling time section and starts to be made whether that regulation and control judge again；

Described Optimized model sets up unit, is used for setting up Optimized model；

Described reactive power sets acquiring unit, for solving-optimizing model, obtains the output of each distributed SVC equipment idle The setting value of power；

Described reactive power sets output unit, for sending corresponding output reactive power to each distributed SVC equipment Setting value.

Preferably, Optimized model sets up unit, is used for setting up Optimized model as follows:

The object function of control module scheduling is:

$min\left(\underset{j=1}{\overset{m}{\&Sigma;}}{Q}_{j\left(set\right)}\right)$

Constraints is:

U_lim1≤U_n(set)

0≤Q_j(set)≤Q_j(max), j=1,2 ..., m

Wherein, Q_j(set)For the setting value of distributed SVC equipment j output reactive power, U_n(set))After carrying out Reactive Power Dispatch The voltage effective value predictive value of node n, Q_j(max)Threshold limit value for distributed SVC equipment j output reactive power.

Preferably, reactive power sets acquiring unit, for solving-optimizing model, obtains the output of each distributed SVC equipment Setting value Q of reactive power_1(set),Q_2(set),…,Q_m(set)；

Calculating U_n(set)Time, realized by following formula:

$U_{n\left(set\right)}=U_n+\underset{j=1}{\overset{m}{\&Sigma;}}{\mathrm{\&alpha;}}_{nj}\&times;Q_{j\left(set\right)}$

Wherein, factor alpha_njBeing distributed SVC equipment j after distribution system injects unit reactive power, distribution system feeds The voltage effective value variable quantity of line load node n.

Preferably, reactive power sets output unit, for sending corresponding output reactive power to each distributed SVC equipment Setting value Q_j(set), j=1,2 ..., m, each distributed SVC equipment is according to setting value Q of corresponding output reactive power_j(set)Produce Raw corresponding reactive power is injected into feeder line；And, factor alpha_njIt is calculated by following formula:

${\mathrm{\&alpha;}}_{nj}=\frac{{\mathrm{\&Delta;U}}_{nj}}{Q_j}$

In formula, Q_jThe reactive power injected to distribution system for distributed SVC equipment j；ΔU_njFor distributed SVC equipment j Reactive power Q is injected to distribution system_jThe voltage effective value variable quantity of back loading node n.

Preferably, described monitoring modular passes through Topology identification algorithm, obtains the position of each load node in distribution system Put and annexation, determine on-position and the position of feeder line reactive-load compensation of distributed SVC equipment, be distributed by multiple spot The collecting of the information that gets of Intelligent Measurement terminal, obtain capacity and each joint of distributed SVC equipment in distribution system The voltage of point.

Preferably, the inverter circuit that main circuit is three-phase three brachium pontis of described SVC equipment, by 6 power electronic devices and DC bus capacitor forms.

Preferably, described SVC equipment uses the modulation system of space vector of voltage, for the ease of straight in alpha-beta coordinate system Connect control, the voltage pulsation caused when reducing switching switch, control SVC output voltage vector in orthohexagonal inscribed circle, Inscribed circle radius isu_dcRepresent the DC capacitor voltage of SVC.

Present invention have the advantage that (1) can Intelligent Recognition and follow the tracks of system run topological sum state change, obtain joint Point voltage, load, the information such as exert oneself of available branch line reactive-load compensation, and regulate reactive-load compensation as information source dynamic and intelligent, The reactive power coordinating each distributed SVC equipment is injected；(2) enable to each node voltage of feeder line in distribution system meet The requirement of standard, coordinating distributed SVC equipment provides reactive power to support to distribution system, further increases distributed SVC The utilization rate of equipment and economic benefit.

Accompanying drawing explanation

Fig. 1 shows the block diagram of a kind of based on the load change idle output of Intelligent adjustment the distribution system of the present invention；

Fig. 2 shows the flow chart of the reactive-load compensation method of a kind of intelligent distribution system based on load.

Detailed description of the invention

Fig. 1 shows a kind of based on the load change idle output of Intelligent adjustment the distribution system 10 of the present invention, this distribution System includes:

Feeder line 14, this feeder line is multiple, for providing electric energy for multiple loads 15；

SVC equipment 12, for providing reactive power for feed line 14 tunnel, to maintain stablizing of feeder line voltage 14, should SVC equipment is multiple 14, and with described feeder line one_to_one corresponding；

Grid-connecting apparatus 13, is used for realizing SVC equipment 12 and feeder line 14 is incorporated into the power networks, this grid-connecting apparatus 13 and described feedback Electric line 14 one_to_one corresponding；

With supervising device 11；

This supervising device 11 includes:

The communication bus 111 that monitoring modular 113, control module 112 communicate with for described each module；

Described monitoring modular 113, for the actual voltage value of multiple load 15 access points of monitoring in real time；

Described control module 112 includes regulating and controlling that judging unit, Optimized model set up unit, reactive power sets acquiring unit Output unit is set, wherein with reactive power:

For distribution system current scheduling period start time, described regulation and control judging unit is made whether that regulation and control judge, bag Including and start at current scheduling period, the voltage that each distributed SVC equipment j uploads corresponding access node to control module respectively has Valid value U_fj, wherein j=1,2 ..., m, monitoring modular uploads voltage effective value U at load node n to control module_n, control module Judge whether U_n<U_lim1, U_lim1The load node voltage effective value lower limit specified for standard, is that then order optimization model is set up Cell operation, otherwise waits for new scheduling time section and starts to be made whether that regulation and control judge again；

Described Optimized model sets up unit, is used for setting up Optimized model；

Described reactive power sets acquiring unit, for solving-optimizing model, obtains the output of each distributed SVC equipment idle The setting value of power；

Described reactive power sets output unit, for sending corresponding output reactive power to each distributed SVC equipment Setting value.

Preferably, Optimized model sets up unit, is used for setting up Optimized model as follows:

The object function of control module scheduling is:

$min\left(\underset{j=1}{\overset{m}{\&Sigma;}}{Q}_{j\left(set\right)}\right)$

Constraints is:

U_lim1≤U_n(set)

0≤Q_j(set)≤Q_j(max), j=1,2 ..., m

Wherein, Q_j(set)For the setting value of distributed SVC equipment j output reactive power, U_n(set))After carrying out Reactive Power Dispatch The voltage effective value predictive value of node n, Q_j(max)Threshold limit value for distributed SVC equipment j output reactive power.

Preferably, reactive power sets acquiring unit, for solving-optimizing model, obtains the output of each distributed SVC equipment Setting value Q of reactive power_1(set),Q_2(set),…,Q_m(set)；

Calculating U_n(set)Time, realized by following formula:

$U_{n\left(set\right)}=U_n+\underset{j=1}{\overset{m}{\&Sigma;}}{\mathrm{\&alpha;}}_{nj}\&times;Q_{j\left(set\right)}$

Wherein, factor alpha_njBeing distributed SVC equipment j after distribution system injects unit reactive power, distribution system feeds The voltage effective value variable quantity of line load node n.

Preferably, reactive power sets output unit, for sending corresponding output reactive power to each distributed SVC equipment Setting value Q_j(set), j=1,2 ..., m, each distributed SVC equipment is according to setting value Q of corresponding output reactive power_j(set)Produce Raw corresponding reactive power is injected into feeder line；And, factor alpha_njIt is calculated by following formula:

${\mathrm{\&alpha;}}_{nj}=\frac{{\mathrm{\&Delta;U}}_{nj}}{Q_j}$

In formula, Q_jThe reactive power injected to distribution system for distributed SVC equipment j；ΔU_njFor distributed SVC equipment j Reactive power Q is injected to distribution system_jThe voltage effective value variable quantity of back loading node n.

Preferably, described monitoring modular passes through Topology identification algorithm, obtains the position of each load node in distribution system Put and annexation, determine on-position and the position of feeder line reactive-load compensation of distributed SVC equipment, be distributed by multiple spot The collecting of the information that gets of Intelligent Measurement terminal, obtain capacity and each joint of distributed SVC equipment in distribution system The voltage of point.

Preferably, the inverter circuit that main circuit is three-phase three brachium pontis of described SVC equipment, by 6 power electronic devices and DC bus capacitor forms.

Preferably, described SVC equipment uses the modulation system of space vector of voltage, for the ease of straight in alpha-beta coordinate system Connect control, the voltage pulsation caused when reducing switching switch, control SVC output voltage vector in orthohexagonal inscribed circle, Inscribed circle radius isu_dcRepresent the DC capacitor voltage of SVC.

Seeing accompanying drawing 2, the reactive-load compensation method of a kind of based on load the intelligent distribution system of the present invention, including walking as follows Rapid:

S1. monitoring modular monitors in distribution system the magnitude of voltage loading access point, and the appearance of distributed SVC equipment in real time Amount；

S2. the current scheduling period start time in distribution system is made whether that regulation and control judge: at current scheduled time Section starts, and monitoring modular uploads voltage effective value U at load node n_n, control module judges: U_n<U_lim1？, it is to enter step S3, otherwise waits for new scheduling time section and starts, and is again made whether that regulation and control judge as next current scheduling period；

S3. control module sets up idle Intelligent adjustment Optimized model；

S4. control module solving-optimizing model；

S5. control module sends corresponding Q to each distributed SVC equipment_j(set), j=1,2 ..., m, each distributed SVC equipment Setting value Q according to corresponding output reactive power_j(set)Produce corresponding reactive power and be injected into feeder line.

Preferably, in step sl, described monitoring modular passes through Topology identification algorithm, obtains in distribution system each negative Carry position and the annexation of node, determine on-position and the position of feeder line reactive-load compensation of distributed SVC equipment, logical Spend the collecting of the information that gets of Intelligent Measurement terminal of multiple spot distribution, obtain the capacity of distributed SVC equipment in distribution system And the voltage of each node.

Preferably, in described step S2, each section start time scheduling time of distribution system, each distributed SVC sets Standby real-time voltage virtual value U needing to upload its access node to control module_f1,U_f2,…,U_fm, this can be by distributed SVC equipment interconnection access point voltage monitoring result and obtain easily.Distributed SVC equipment j uploads U to control module in real time_fj (j=1,2 ..., m).

Preferably, in described step S3, control module sets up Optimized model shown in formula (1), formula (2), formula (3):

$\min \left(\underset{j=1}{\overset{m}{\&Sigma;}}{Q}_{j\left(set\right)}\right)---\left(1\right)$

Constraints is:

U_lim1≤U_n(set) (2)

0≤Q_j(set)≤Q_j(max), j=1,2 ..., m (3)

Formula (1) represents that the summation of the distributed SVC equipment output reactive power of required scheduling is minimum, to reduce scheduling nothing The cost of merit power, Q_j(set)For the setting value of distributed SVC equipment j output reactive power, U in formula (2)_n(set)Idle for carrying out The voltage effective value predictive value of scheduling posterior nodal point n so that it is not less than U_lim1；Formula (3) is that the output of each distributed SVC equipment is idle The restrictive condition of power, wherein Q_j(max)For distributed SVC equipment j output reactive power Q_jThreshold limit value, this limit value is normal Amount, can know according to the characteristic of distributed SVC equipment, can be stored in advance in control module in the planning and designing stage.

Preferably, in described step S4, control module solving-optimizing model, obtain Q_1(set),Q_2(set),…,Q_m(set):

By each distributed SVC equipment output reactive power Q of seismic responses calculated₁,Q₂,…,Q_mSetting value Q_1(set), Q_2(set),…,Q_m(set)；

Can be solved with formula (1) as object function by the most ripe linearly or nonlinearly planing method, formula (2) and formula (3) be the optimization problem of constraints, thus Q_1(set),Q_2(set),…,Q_m(set)。

Preferably, U is being calculated_n(set)Time, can be carried out by following formula:

$U_{n\left(set\right)}=U_n+\underset{j=1}{\overset{m}{\&Sigma;}}{\mathrm{\&alpha;}}_{nj}\&times;Q_{j\left(set\right)}---\left(4\right)$

In formula, factor alpha_njBeing distributed SVC equipment j after network injects unit reactive power, power distribution network feeder line saves The voltage effective value variable quantity of some n, is formulated as:

${\mathrm{\&alpha;}}_{nj}=\frac{{\mathrm{\&Delta;U}}_{nj}}{Q_j}---\left(5\right)$

In formula, subscript j represents distributed SVC device numbering, j=1,2 ..., m；Q_jFor distributed SVC equipment j to distribution The reactive power that net injects；ΔU_njReactive power Q is injected to power distribution network for distributed SVC equipment j_jThe voltage of posterior nodal point n is effective Value variable quantity.

Preferably, in step s 5, Q is being obtained_1(set),Q_2(set),…,Q_m(set)After, control module passes through bidirectional communication line The each distributed SVC equipment of road direction transmits reactive power setting value Q_j(set), each distributed SVC equipment is according to this setting value Q_j(set)Produce Raw corresponding reactive power is injected into feeder line, thus meets the constraints shown in formula (2).

Above content is to combine concrete preferred implementation further description made for the present invention, it is impossible to assert Being embodied as of the present invention is confined to these explanations.For general technical staff of the technical field of the invention, On the premise of present inventive concept, make some equivalents and substitute or obvious modification, and performance or purposes are identical, all should It is considered as belonging to protection scope of the present invention.

Claims (7)

1. a distribution system based on the load change idle output of Intelligent adjustment, this distribution system includes:

Feeder line, this feeder line is multiple, for providing electric energy for multiple loads；

SVC equipment, for providing reactive power for feeder line, to maintain stablizing of feeder line voltage, this SVC equipment is many Individual, and with described feeder line one_to_one corresponding；

Grid-connecting apparatus, is used for realizing SVC equipment and feeder line is incorporated into the power networks, this grid-connecting apparatus and described feeder line one a pair Should；

And supervising device；

This supervising device includes:

The communication bus that monitoring modular, control module communicate with for described each module；

Described monitoring modular, for the actual voltage value of the multiple load access points of monitoring in real time；

Described control module includes regulating and controlling that judging unit, Optimized model set up unit, reactive power sets acquiring unit and idle Power setting output unit, wherein:

For distribution system current scheduling period start time, described regulation and control judging unit is made whether that regulation and control judge, be included in Current scheduling period starts, and each distributed SVC equipment j uploads the voltage effective value of corresponding access node respectively to control module U_fj, wherein j=1,2 ..., m, monitoring modular uploads voltage effective value U at load node n to control module_n, control module judges Whether U_n<U_lim1, U_lim1The load node voltage effective value lower limit specified for standard, is that unit set up by order optimization model Work, otherwise waits for new scheduling time section and starts to be made whether that regulation and control judge again；

Described Optimized model sets up unit, is used for setting up Optimized model；

Described reactive power sets acquiring unit, for solving-optimizing model, obtains each distributed SVC equipment output reactive power Setting value；

Described reactive power sets output unit, for sending the setting of corresponding output reactive power to each distributed SVC equipment Value.

2. the system as claimed in claim 1, it is characterised in that described Optimized model sets up unit, is used for setting up Optimized model As follows:

The object function of control module scheduling is:

$min\left(\underset{j=1}{\overset{m}{\&Sigma;}}{Q}_{j\left(set\right)}\right)$

Constraints is:

U_lim1≤U_n(set)

0≤Q_j(set)≤Q_j(max), j=1,2 ..., m

Wherein, Q_j(set)For the setting value of distributed SVC equipment j output reactive power, U_n(set))For carrying out Reactive Power Dispatch posterior nodal point n Voltage effective value predictive value, Q_j(max)Threshold limit value for distributed SVC equipment j output reactive power.

3. system as claimed in claim 2, it is characterised in that reactive power sets acquiring unit, for solving-optimizing model, Obtain setting value Q of each distributed SVC equipment output reactive power_1(set),Q_2(set),…,Q_m(set)；

Calculating U_n(set)Time, realized by following formula:

$U_{n\left(set\right)}=U_n+\underset{j=1}{\overset{m}{\&Sigma;}}{\mathrm{\&alpha;}}_{nj}\&times;Q_{j\left(set\right)}$

Wherein, factor alpha_njIt is distributed SVC equipment j after distribution system injects unit reactive power, distribution system feeder line The voltage effective value variable quantity of load node n.

4. system as claimed in claim 3, it is characterised in that reactive power sets output unit, for each distributed SVC Equipment sends setting value Q of corresponding output reactive power_j(set), j=1,2 ..., m, each distributed SVC equipment is according to corresponding output Setting value Q of reactive power_j(set)Produce corresponding reactive power and be injected into feeder line；And, factor alpha_njCalculated by following formula Obtain:

${\mathrm{\&alpha;}}_{nj}=\frac{{\mathrm{\&Delta;U}}_{nj}}{Q_j}$

In formula, Q_jThe reactive power injected to distribution system for distributed SVC equipment j；ΔU_njFor distributed SVC equipment j to joining Electricity system injects reactive power Q_jThe voltage effective value variable quantity of back loading node n.

5. system as claimed in claim 4, it is characterised in that described monitoring modular passes through Topology identification algorithm, obtains The position of each load node and annexation in distribution system, determine the on-position of distributed SVC equipment and feeder line without The position that merit compensates, collecting of the information that the Intelligent Measurement terminal being distributed by multiple spot is got, obtains being distributed in distribution system The capacity of formula SVC equipment and the voltage of each node.

6. the system as claimed in claim 1, it is characterised in that the inversion that main circuit is three-phase three brachium pontis of described SVC equipment Circuit, is made up of 6 power electronic devices and DC bus capacitor.

7. system as claimed in claim 6, it is characterised in that described SVC equipment uses the modulation system of space vector of voltage, For the ease of directly controlling in alpha-beta coordinate system, the voltage pulsation caused when reducing switching switch, control SVC output voltage and vow Amount is in orthohexagonal inscribed circle, and inscribed circle radius isu_dcRepresent the DC capacitor voltage of SVC.