CN105576718A - AC/DC distribution network source-load optimal distribution control method under distributed new energy high permeability condition - Google Patents
AC/DC distribution network source-load optimal distribution control method under distributed new energy high permeability condition Download PDFInfo
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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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
Abstract
The invention discloses an AC/DC distribution network source-load optimal distribution control method under a distributed new energy high permeability condition. The method comprises the following steps: 1) determining an optimal distribution control system of distributed power sources; 2) carrying out active and reactive decoupling control on the distributed power sources; 3) carrying out active output optimal distribution between the various distributed power sources; 4) realizing frequency stabilization of an AC part and voltage stabilization of a DC part of an AC/DC distribution network according to an active control adjusting strategy of the distributed power sources; 5) carrying out reactive power optimization distribution between the various distributed power sources; 6) realizing voltage regulation of the AC part of the AC/DC distribution network according to a reactive control adjusting strategy of the distributed power sources; and 7) correcting the deviation with the reactive power of the AC part of the AC/DC distribution network. The method can optimize active output and reactive distribution of the voltage and load in the AC/DC distribution network, and thus safety of an electric system and power quality of the AC/DC distribution network are improved.
Description
Technical field
Under the present invention relates to a kind of distributed new high permeability situation, alternating current-direct current distribution source lotus optimizes a point distribution controlling method, belongs to alternating current-direct current distribution technique field.
Background technology
Work when electrical power trans mission/distribution system produces, direct current just by as topmost distribution system, but due to the reasons such as direct current transmission and distribution electric pressure was low at that time, capacity is little make DC distribution replace by AC distribution.
Flourish along with power electronic technology no matter be distribution system itself, or final power consumer adopts DC distribution or power consumption equipment all more and more.And traditional power distribution system is unified, and what mainly adopt over more than hundred year is AC distribution pattern, therefore these direct currents are joined power consumption equipment and to be had to adopt DC/AC converter or AC/DC rectifier, just can be incorporated to alternating-current system or obtain supply of electric power from alternating-current system.
Adopt direct-flow distribution system to simplify and existingly join ac-dc conversion links a large amount of in power consumption equipment, reduce the loss of the energy in transmitting procedure, improve efficiency of energy utilization.Along with the extensive use of power electronic technology in distribution system, people start to think deeply and adopt the technical and economic feasibility of DC distribution, have demand will be dynamic, and these demands become the original actuating force of DC distribution technical development.
The U.S., Japan and the countries and regions such as European just start the research of data communication center DC distribution the nineties in 20th century.And the DC-zonal electric distribution technology of the special application fields such as warship, aviation and hybrid-electric car also reaches its maturity.These are all that DC distribution provides the foundation to applying of the field such as factory, house.
Along with the high speed development with information technology that increases rapidly of city size, sensitive load in electrical network, important load and nonlinear-load are more and more, AC distribution net will face that line loss is large, power supply corridor is nervous, and a series of power quality problem such as voltage sag, voltage fluctuation, mains by harmonics, the aggravation of three-phase imbalance phenomenon, in the urgent need to changing existing distribution net work structure and joining (confession) mode.In recent years, some scholars has carried out correlative study to alternating current-direct current mixing distribution system, confirms that alternating current-direct current mixing distribution system is by a kind of feasible approach of AC distribution mode to the transition gradually of DC distribution mode.If adopt direct current to join (confession) electric mode, then the electric energy that all kinds of power supply produces can be converted to direct current and directly supply various kinds of equipment and household electrical appliance use.Pertinent literature shows, DC distribution netting gear is improved power supply capacity, reduces line loss, improves the user side quality of power supply, isolation alternating current-direct current fault, and the series of advantages such as regenerative resource is flexible, convenient access.
In flexible direct current distribution technique application model, although proposed the topological structure of some DC distribution nets both at home and abroad, but in concrete engineering, illustrate for which kind of topological structure being adopted not provide when considering the complicated factors such as distributed electrical source distribution, part throttle characteristics, electricity consumption requirement and instruct, do not set up the typical topology model library of DC power-supply system, and not yet occur both at home and abroad the research to distributed new in DC power-supply system, energy storage and load optimized configuring technical aspect.Therefore, urgently carry out the direct current supply model study being applicable to distributed new, realize distributed new direct current and collect the reliable and optimizing operation of the power supply supplying system with power distribution network AC/DC mutually.
In interchange distribution, along with the access of the flexible apparatus such as distribution static reactive power compensator, dynamic electric voltage recovery device, the spy bosom of power distribution network there occurs some new changes, the operation characteristic characteristic of Static Var Compensator, the system running pattern of research trends voltage resume device needs to be furtherd investigate further on the impact exchanging distribution with characteristic.
Summary of the invention
For the deficiency that prior art exists, under the object of the invention is to provide a kind of distributed new high permeability situation, alternating current-direct current distribution source lotus optimizes a point distribution controlling method, voltage can be optimized and the meritorious of load is exerted oneself and idle distribution in the middle of alternating current-direct current distribution, the dynamic steady state performance of optimizing operation characteristic and system, promotes the fail safe of electric power system and the quality of power supply of alternating current-direct current distribution.
To achieve these goals, the present invention realizes by the following technical solutions:
Under a kind of distributed new high permeability situation of the present invention, alternating current-direct current distribution source lotus optimizes a point distribution controlling method, specifically comprises following step:
(1) determine that the optimization of distributed power source distributes control system;
(2) meritorious and idle uneoupled control are carried out to distributed power source;
(3) when the alternating current-direct current power distribution network having multiple distributed new to access loses bulk power grid support, optimized between all kinds of distributed power source by energy management module and distribute meritorious situation of exerting oneself, make the frequency of alternating current-direct current distribution AC portion and the voltage of direct current component finally be stabilized in set-point;
(4) according to the real power control regulation strategy of distributed power source, frequency stabilization and the direct current component voltage stabilization of alternating current-direct current distribution AC portion is realized;
(5) when the alternating current-direct current power distribution network having multiple distributed new to access loses bulk power grid support, between all kinds of distributed power source, carry out idle work optimization distribution by energy management module, make the voltage stabilization of alternating current-direct current distribution AC portion at set-point;
(6) according to the idle regulating and controlling strategy of distributed power source, the voltage-regulation of alternating current-direct current distribution AC portion is realized;
(7) corrected deviation by the reactive power of distributed power source AC portion, reactive power is controlled by d shaft current.
In step (1), the control of the optimization distribution control system of described distributed power source is all carried out under dq0 coordinate system, the component crossing given d axle and q axle controls active power and the reactive power of AC, the set-point of active power and Reactive Power Control is current value, and this current value is given by energy management module.
In step (2), method that is meritorious and idle uneoupled control carried out to distributed power source as follows: can mistake dq0 coordinate transform, the three phase power of distributed power source AC is transformed to the d axle of three-phase current under dq0 coordinate system and q axle component; Control d axle component can be crossed to control the active power of AC, control q axle component can be crossed to control the reactive power of AC, and then realize meritorious and idle uneoupled control.
In step (3), the meritorious reference value that energy management module exports is:
Wherein,
the new forms of energy exported for frequency droop controller are gained merit force value,
for the adjusted value of exerting oneself sent under the pi regulator effect of frequency retrieval module;
Wherein,
regulating characteristics be:
wherein, K
wm, ω
0, ω
n, be respectively PI adjustment factor, specified angular frequency and current angular frequency;
regulating characteristics be:
wherein, K
pRsand K
iRsbe respectively power recover coefficient and power recovery integral coefficient;
Transfer function is:
By configuration gain amplifier COEFFICIENT K
pdwith integration gain factor K
id, make distributed power source active power of output error free compared with given reference value, finally reach the object of stabilized frequency.
In step (5), the transfer function of voltage resume controller is:
By configuration gain amplifier COEFFICIENT K
pqwith Reactive-power control integration gain factor K
ip, make distributed power source output reactive power error free compared with given reference value.
In step (7), the reactive current of correction is:
Wherein,
q shaft current corresponding to electricity district, distributed power source place load power, m
pffor compensating factor; Load power factor pf
lwith the load power factor pf of its prestige
cpass be:
The present invention optimizes voltage and the meritorious of load in the middle of alternating current-direct current distribution to exert oneself and idle distribution, the dynamic steady state performance of optimizing operation characteristic and system, promote fail safe and the quality of power supply of alternating current-direct current distribution, in conjunction with the situation of distribution development, effectively can solve the source lotus optimization problem in alternating current-direct current distribution, create economic worth.
Accompanying drawing explanation
Fig. 1 is that alternating current-direct current distribution source lotus optimizes a point distribution controlling method block diagram;
Fig. 2 is energy management module block diagram;
Fig. 3 is the dq shaft current controller of distributed power source;
Fig. 4 (a) is q axis scale integral controller;
Fig. 4 (b) is q axle frequency retrieval controller;
Fig. 5 is that power factor is repaid control block diagram.
Embodiment
The technological means realized for making the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further.
Under a kind of distributed new high permeability situation, alternating current-direct current distribution source lotus optimizes a point distribution controlling method, comprising: the system level design (2) that (1) optimizes point distribution controlling method carries out control method that is meritorious and idle uneoupled control to distributed power source; (3) when the alternating current-direct current power distribution network having a large amount of distributed new to access loses bulk power grid support, realize rational energy management algorithm between all kinds of distributed power source, optimize the meritorious situation of exerting oneself of distribution; (4) the meritorious regulating and controlling strategy of distributed power source, realizes frequency stabilization and the direct current component voltage stabilization of alternating current-direct current distribution AC portion; (5) when the alternating current-direct current power distribution network having a large amount of distributed new to access loses bulk power grid support, realize rational energy management algorithm and carry out idle work optimization distribution between all kinds of distributed power source; (6) the idle regulating and controlling strategy of distributed power source, realizes the voltage-regulation of alternating current-direct current distribution AC portion; (7) the load power factor Corrective control in multiple distributed new access region.
In step (1); The optimization distribution of distributed power source and control module comprise: this locality processing module, energy management module, Current Control and gate signal generation module.Wherein local signal processing module can cross the voltage measuring DG, obtains frequency and phase angle signal; Energy management module is that DG distributes power; Current Control and gate signal generation module are used for controlling the current transformation loop of distributed power source.As shown in Figure 1.
Local signal processing module gathers the voltage and current of distributed power source process, and carrying out necessary analysis for energy management module and Current Control provides parameter, particularly frequency f and the phase angle ω of necessity with gate signal generation module
t.The control of whole system is all carried out under dq0 coordinate system, and the component crossing given d axle and q axle controls active power and the reactive power of AC, and the set-point of the control of these power is current values.This current value is given by energy management module.
In step (2), control method that is meritorious and idle uneoupled control is carried out to distributed power source, can mistake dq0 coordinate transform, the three phase power of distributed power source AC is transformed to the d axle of three-phase current under dq0 coordinate system and q axle component.Control d axle component can be crossed to control the active power of AC, control q axle component can be crossed to control the reactive power of AC, and then realize meritorious and idle uneoupled control.
In step (3), when the alternating current-direct current power distribution network having a large amount of distributed new to access loses bulk power grid support, realize rational energy management algorithm between all kinds of distributed power source, optimize the meritorious situation of exerting oneself of distribution, in energy management module, adopt a frequency droop controller and frequency retrieval link (AC portion)/voltage resume link (direct current component), realize active distribute and the adjustment of power supply and load, and ensure that the frequency of the part that alternating current-direct current distribution exchanges and direct current component voltage are finally stabilized in set-point, and meet its dynamic characteristic.
That is, the meritorious reference value exported by energy management module is:
Wherein P
reffor the value and power reference that energy management unit exports,
the new forms of energy exported for droop control device are gained merit force value,
issuing the adjusted value of exerting oneself through going out in the pi regulator effect for frequency retrieval module, being used for losing when bulk power grid supports in alternating current-direct current distribution, regulating power supply to frequency retrieval to set-point by energy pipe module.
Wherein
regulating characteristics be:
regulating characteristics be:
The transfer function block diagram of energy management module as shown in Figure 2.
In step (4), the meritorious regulating and controlling strategy of distributed power source, realize frequency stabilization and the direct current component voltage stabilization of alternating current-direct current distribution AC portion, according to the set-point of energy management module, can PI controller be crossed and introduce feedback loop to regulate the output of rectifier, make the stable state of system AC portion frequency and direct current component voltage and dynamic property reach requirement.
At Current Control and pulse generating module, the dq shaft current controller of distributed power source is made up of a PI controller, as shown in Figure 3.
Its transfer function is:
By reasonably configuring gain amplifier COEFFICIENT K
pdwith integration gain factor K
id, satisfyingly make distributed power source active power of output floating compared with given reference value, and there is response speed and less overshoot faster.
In step (5), when the alternating current-direct current power distribution network having a large amount of distributed new to access loses bulk power grid support, realize rational energy management algorithm and carry out idle work optimization distribution between all kinds of distributed power source, in energy management module, adopt a voltage droop control device and a voltage resume controller to make the voltage stabilization of alternating current-direct current distribution AC portion at set-point, and its dynamic property is met the demands.
Reactive power voltage resume controller transfer function is:
The droop characteristic of reactive power and the control block diagram of voltage resume controller are as shown in Figure 4.
By reasonably configuring gain amplifier COEFFICIENT K
pqwith storage gain system K
ip, satisfyingly make distributed power source output reactive power floating compared with given reference value, and there is response speed and less overshoot faster.
In step (6), distributed power source is idle regulating and controlling strategy, realize the voltage-regulation of alternating current-direct current distribution AC portion, according to the set-point of energy management module, can PI controller be crossed and introduce feedback loop to regulate the output of rectifier, make the stable state of system AC portion voltage and dynamic property reach requirement.
In step (7), the load power factor Corrective control in multiple distributed new access region, energy management mould can respond to alternating current-direct current distribution AC load area power factor deviation, and the distributed power source in control area makes correction to power factor deviation.
The reactive power of correction for drift by distributed power source AC portion is completed.Reactive power is controlled by d shaft current.Reactive current in Correction Strategies proposed by the invention is:
Wherein,
q shaft current corresponding to electricity district, distributed power source place load power, m
pffor compensating factor.Load power factor pf
l, with the load power factor pf of its prestige
cpass be:
as shown in Figure 5.
More than show and describe general principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection range is defined by appending claims and equivalent thereof.
Claims (6)
1. under distributed new high permeability situation, alternating current-direct current distribution source lotus optimizes a point distribution controlling method, it is characterized in that, specifically comprises following step:
(1) determine that the optimization of distributed power source distributes control system;
(2) meritorious and idle uneoupled control are carried out to distributed power source;
(3) when the alternating current-direct current power distribution network having multiple distributed new to access loses bulk power grid support, optimized between all kinds of distributed power source by energy management module and distribute meritorious situation of exerting oneself, make the frequency of alternating current-direct current distribution AC portion and the voltage of direct current component finally be stabilized in set-point;
(4) according to the real power control regulation strategy of distributed power source, frequency stabilization and the direct current component voltage stabilization of alternating current-direct current distribution AC portion is realized;
(5) when the alternating current-direct current power distribution network having multiple distributed new to access loses bulk power grid support, between all kinds of distributed power source, carry out idle work optimization distribution by energy management module, make the voltage stabilization of alternating current-direct current distribution AC portion at set-point;
(6) according to the idle regulating and controlling strategy of distributed power source, the voltage-regulation of alternating current-direct current distribution AC portion is realized;
(7) corrected deviation by the reactive power of distributed power source AC portion, reactive power is controlled by d shaft current.
2. under distributed new high permeability situation according to claim 1, alternating current-direct current distribution source lotus optimizes a point distribution controlling method, it is characterized in that, in step (1), the control of the optimization distribution control system of described distributed power source is all carried out under dq0 coordinate system, the component crossing given d axle and q axle controls active power and the reactive power of AC, the set-point of active power and Reactive Power Control is current value, and this current value is given by energy management module.
3. under distributed new high permeability situation according to claim 2, alternating current-direct current distribution source lotus optimizes a point distribution controlling method, it is characterized in that, in step (2), method that is meritorious and idle uneoupled control carried out to distributed power source as follows: can mistake dq0 coordinate transform, the three phase power of distributed power source AC is transformed to the d axle of three-phase current under dq0 coordinate system and q axle component; Control d axle component can be crossed to control the active power of AC, control q axle component can be crossed to control the reactive power of AC, and then realize meritorious and idle uneoupled control.
4. under distributed new high permeability situation according to claim 1, alternating current-direct current distribution source lotus optimizes a point distribution controlling method, it is characterized in that, in step (3), the meritorious reference value that energy management module exports is:
Wherein,
the new forms of energy exported for frequency droop controller are gained merit force value,
for the adjusted value of exerting oneself sent under the pi regulator effect of frequency retrieval module;
Wherein,
regulating characteristics be:
wherein, K
wm, ω
0, ω
n, be respectively PI adjustment factor, specified angular frequency and current angular frequency;
regulating characteristics be:
wherein, K
pRsand K
iRsbe respectively power recover coefficient and power recovery integral coefficient;
Transfer function is:
By configuration gain amplifier COEFFICIENT K
pdwith integration gain factor K
id, make distributed power source active power of output error free compared with given reference value, finally reach the object of stabilized frequency.
5. under distributed new high permeability situation according to claim 1, alternating current-direct current distribution source lotus optimizes a point distribution controlling method, and it is characterized in that, in step (5), the transfer function of voltage resume controller is:
By configuration gain amplifier COEFFICIENT K
pqwith Reactive-power control integration gain factor K
ip, make distributed power source output reactive power error free compared with given reference value.
6. under distributed new high permeability situation according to claim 1, alternating current-direct current distribution source lotus optimizes a point distribution controlling method, and it is characterized in that, in step (7), the reactive current of correction is:
Wherein,
q shaft current corresponding to electricity district, distributed power source place load power, m
pffor compensating factor; Load power factor pf
1with the load power factor pf of its prestige
cpass be:
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Cited By (3)
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| CN107528352A (en) * | 2017-08-29 | 2017-12-29 | 国网江苏省电力公司淮安供电公司 | A kind of power distribution network active optimization method based on regenerative resource high permeability |
| CN109149564A (en) * | 2018-08-31 | 2019-01-04 | 国网浙江省电力有限公司经济技术研究院 | A kind of alternating current-direct current mixing power distribution network distributed generation resource Optimal Configuration Method |
| CN109688061A (en) * | 2018-12-17 | 2019-04-26 | 贵州电网有限责任公司 | A kind of easy-to-dismount router |
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