CN109412168A - Reactive voltage decentralized coordinated control system based on distributed photovoltaic power - Google Patents
Reactive voltage decentralized coordinated control system based on distributed photovoltaic power Download PDFInfo
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- CN109412168A CN109412168A CN201811353101.1A CN201811353101A CN109412168A CN 109412168 A CN109412168 A CN 109412168A CN 201811353101 A CN201811353101 A CN 201811353101A CN 109412168 A CN109412168 A CN 109412168A
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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
- H02J3/12—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load by adjustment of reactive power
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
本发明公开了一种基于分布式光伏电源的无功电压分散协调控制系统，包括并网逆变器、若干组电抗器、若干组电容器，所述并网逆变器采用PV控制输出定量的有功功率，并按协调控制策略逻辑在逆变器、电抗器组、电容器组间分配无功功率，从而使并网点电压保持在设定范围内，所述协调控制策略逻辑为：实时监测逆变器闲置无功能力是否低于警戒线，若是，则依据逆变器输出的无功功率性质，划分为两种情况进行不同的处理方式。本发明使并网逆变器进行无功功率的动态精补偿，使电容器组、电抗器组进行无功功率的动态粗补偿；在所设计的无功补偿控制系统支持下保证系统的电压水平，解决系统中含分布式光伏配电线路中可能出现的电压偏高或者偏低问题。
The invention discloses a reactive power and voltage distributed coordination control system based on distributed photovoltaic power supply, comprising a grid-connected inverter, several groups of reactors, and several groups of capacitors. The grid-connected inverter adopts PV control to output quantitative active power. power, and distribute reactive power among inverters, reactor banks, and capacitor banks according to the coordinated control strategy logic, so as to keep the voltage at the grid connection point within the set range. The coordinated control strategy logic is: real-time monitoring of the inverter Whether the idle reactive power is lower than the warning line, if so, according to the nature of the reactive power output by the inverter, it is divided into two cases for different processing methods. The invention enables the grid-connected inverter to perform dynamic fine compensation of reactive power, and enables the capacitor bank and the reactor bank to perform dynamic rough compensation of reactive power; and under the support of the designed reactive power compensation control system, the voltage level of the system is ensured, Solve the problem of high or low voltage that may occur in distributed photovoltaic power distribution lines in the system.
Description
Technical field
The present invention relates to electric power project engineerings, and in particular to the reactive voltage decentralized coordinating control based on distributed photovoltaic power
System processed.
Background technique
In recent years, photovoltaic power generation ratio shared in world energy sources total amount is gradually increased, be it is with the fastest developing speed at present,
Prospect one of renewable energy industry the most good.But since photovoltaic power generation is influenced by temperature and intensity of illumination, so that
Photovoltaic power generation power output has the characteristics that intermittent and uncertainty, this makes the utilization rate of photovoltaic combining inverter be only 20% left side
The right side, and frequent switching can also be such that grid stability declines, and bring various disturbances to power distribution network, influence power quality.And light
An overhead utility in general active power of output is not sent out idle, but the electric load in power distribution network, which will not only absorb, has power also
Absorbing reactive power is wanted, the loss of electric energy not only reduces power supply efficiency also and will cause the fluctuation of voltage.Thus photovoltaic plant
The grid-connected safe and stable operation tool to power grid has very serious implications.
With the development of electric power network technique, the capacity of the reactive load in power grid is continuously increased, and a large amount of reactive power exists
Transmission can reduce the quality and utilization rate of electric energy, therefore the reactive power source that shunt capacitor group is important as one kind in power grid,
The voltage of electric system is adjusted and is used widely in reactive compensation.
The effect of parallel capacity reactive compensation is mainly reduced with increase power factor to the power and capacity in equipment
Loss, while the quality of power supply can also be improved, and to supply voltage by stabilization.Shunt capacitor is installed to do nothing
Function compensation, thus can be reduced the voltage loss of route, and mention in power grid with the transmission of limit value reactive power
The high quality of voltage of power grid.
Route is unloaded or at light load, it will causes voltage to increase, needs shunt reactor just at this time to improve along line voltage
Reactive power distribution in distribution and light-loaded circuit.Inductance energy compensated line direct-to-ground capacitance in shunt reactor reduces current through line
Capacitance current, the voltage of restraining line road increases；Capacitive charge power can be supplemented, absorbing reactive power reduces line loss, mentions
High Power Factor stablizes the working voltage of power grid, improves power supply quality.
Summary of the invention
The reactive voltage dispersion based on distributed photovoltaic power that the technical problem to be solved by the invention is to provide a kind of
Coordinated control system improves power supply efficiency, avoids voltage fluctuation, maintain the safe and stable operation of power grid.
In order to solve the above technical problems, the present invention adopts the following technical scheme: the idle electricity based on distributed photovoltaic power
Decentralized coordinated control system, including gird-connected inverter, several groups reactor, several group capacitors, the gird-connected inverter is pressed to adopt
Quantitative active power is exported with PV control, and is divided between inverter, reactor group, capacitor group by coordination control strategy logic
With reactive power, thus keep grid entry point voltage within the set range, the coordination control strategy logic are as follows: real-time monitoring is inverse
Become whether the idle reactive power capability of device is lower than warning line, if so, the reactive power property according to inverter output, is divided into two kinds
Situation carries out different processing modes,
(1) inverter issues reactive power:
The reactor group to put into operation is first detected whether, if so, sequentially cutting out one group of electricity then according to the principle of first in first out
Anti- device, and circulation is reentered after reactor group is cut out；If nothing, all capacitor groups for having put into configuration are detected whether,
If so, explanation has been in extreme situation at this time, system can not put into reactive power compensator further to improve and be likely to occur
Voltage Drop, therefore according to the adjustment amplitude of setting, the voltage setting value of inverter PV control is turned down, to discharge sizableness in one
The idle capacity of group capacitor carries out pressure regulation；If still there is the capacitor group not put into operation, one is put into according to advanced principle is first gone out
Group capacitor；
(2) inverter absorbing reactive power:
The capacitor group to put into operation is first detected whether, if so, sequentially cutting out one group of electricity then according to the principle of first in first out
Container, and circulation is reentered after capacitor group is cut out；If nothing, all reactor groups for having put into configuration are detected whether,
If so, explanation has been in extreme situation at this time, system can not put into reactive power compensator further to improve and be likely to occur
Voltage increases, therefore according to the adjustment amplitude of setting, the voltage setting value of inverter PV control is turned up, to discharge sizableness in one
The idle capacity of group capacitor carries out pressure regulation；If still there is the reactor group not put into operation, one is put into according to advanced principle is first gone out
Group reactor.
Preferably, every group of reactor, the capacity of capacitor are equal, and caused voltage is moved back in the throwing of every group of reactor, capacitor
The 50% of the grid entry point range of regulation that variation is set before being not to be exceeded.
Preferably, the capacity of every group capacitor and inverter Capacity Margin are close as far as possible.
Preferably, biggish integer is taken divided by every grade of capacity by the capacitor/reactor total capacity configured, determines capacitor
Device/reactor switching gear number, and with capacitor/reactor total capacity of this gear number amendment configuration.
The present invention by adopting the above technical scheme, designs a kind of using gird-connected inverter residual capacity and switched capacitor in groups
The reactive compensation coordinated control system that group, in groups switching reactor group combine makes gird-connected inverter carry out the dynamic of reactive power
The compensation of state essence makes capacitor group, reactor group carry out the dynamic coarse compensation of reactive power；In designed the control of reactive power compensating system
System supports the voltage level of lower guarantee system, the voltage being likely to occur in distribution line containing distributed photovoltaic in solution system higher
Or relatively low problem.
The specific technical solution of the present invention and its advantages will in the following detailed description in conjunction with attached drawing into
Row detailed description.
Detailed description of the invention
Present invention will be further described below with reference to the accompanying drawings and specific embodiments:
Fig. 1 is by control strategy figure of the invention；
Fig. 2 is that primary equipment of the present invention constitutes figure.
Specific embodiment
Photovoltaic parallel in system power output has the characteristics that typical uncertain, intermittence, influences Power System Steady-state voltage's distribiuting,
While distorting it is also possible that obtaining network voltage, voltage fluctuation is generated, therefore study the influence of photovoltaic electric station grid connection, to containing photovoltaic electric
Power distribution network of standing carries out the determination of reactive compensation and the selection in reactive compensation place and reactive compensation capacity, to the safety of power grid,
Reliably, economical operation tool has very great significance.
Refering to what is shown in Fig. 1, the reactive voltage decentralized coordinated control system based on distributed photovoltaic power, including parallel network reverse
Device, several groups reactor, several group capacitors, the gird-connected inverter exports quantitative active power using PV control, and presses
Coordination control strategy logic distributes reactive power between inverter, reactor group, capacitor group, so that grid entry point voltage be made to keep
Within the set range, the coordination control strategy logic are as follows: whether the idle reactive power capability of real-time monitoring inverter is lower than warning line,
If so, the reactive power property according to inverter output, is divided into two kinds of situations and carries out different processing modes,
(1) inverter issues reactive power:
The reactor group to put into operation is first detected whether, if so, sequentially cutting out one group of electricity then according to the principle of first in first out
Anti- device, and circulation is reentered after reactor group is cut out；If nothing, all capacitor groups for having put into configuration are detected whether,
If so, explanation has been in extreme situation at this time, system can not put into reactive power compensator further to improve and be likely to occur
Voltage Drop, therefore according to the adjustment amplitude of setting, the voltage setting value of inverter PV control is turned down, to discharge sizableness in one
The idle capacity of group capacitor carries out pressure regulation；If still there is the capacitor group not put into operation, one is put into according to advanced principle is first gone out
Group capacitor.
(2) inverter absorbing reactive power:
The capacitor group to put into operation is first detected whether, if so, sequentially cutting out one group of electricity then according to the principle of first in first out
Container, and circulation is reentered after capacitor group is cut out；If nothing, all reactor groups for having put into configuration are detected whether,
If so, explanation has been in extreme situation at this time, system can not put into reactive power compensator further to improve and be likely to occur
Voltage increases, therefore according to the adjustment amplitude of setting, the voltage setting value of inverter PV control is turned up, to discharge sizableness in one
The idle capacity of group capacitor carries out pressure regulation；If still there is the reactor group not put into operation, one is put into according to advanced principle is first gone out
Group reactor.
Control system coordinated control gird-connected inverter that the present invention designs, switched capacitor group, in groups switching reactance in groups
Device group, to maintain grid entry point voltage within a preset range for target, dynamic compensates the reactive requirement in distribution line, once sets
It is standby to constitute as shown in Figure 2.
Wherein, every grade of reactor, the capacity of capacitor are equal, which is carried out by the network connection situation in concrete case
It calculates, the 50% of the grid entry point range of regulation that voltage change caused by every grade of throwing is moved back in principle is set before being not to be exceeded.Such as
Preceding setting ± 2%, then voltage change range caused by every grade of throwing is moved back are not to be exceeded the 2% of voltage rating.While every grade of capacity is also
It need to cooperate with inverter Capacity Margin, it is close as far as possible with the Capacity Margin of inverter.One group capacitor of such switching/reactor,
The idle reactive power capability of i.e. releasable inverter is used for dynamic regulation, is also unlikely to due to one group of switching excessive capacitor/electricity
Anti- device leads to the reversed idle reactive power capability of the idle reversion of dynamic regulation and inverter of using up, and the overfill of burst device occurs
It repays, discharges residual capacity really.
Biggish integer is taken divided by every grade of capacity by the capacitor/reactor total capacity configured, determines capacitor/reactor
Switching gear number, and with this gear number amendment configuration capacitor/reactor total capacity.
Successful design of the present invention it is a kind of with gird-connected inverter residual capacity with switched capacitor group in groups, switching electricity in groups
The reactive compensation coordinated control system that anti-device group combines, the system can make gird-connected inverter carry out reactive power well
Dynamic essence compensation, makes capacitor group, reactor group carry out the dynamic coarse compensation of reactive power, by the simulation results show system
It can be very good to solve the problems, such as because of distributed photovoltaic bring reactive voltage.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, is familiar with
The those skilled in the art should be understood that the present invention includes but is not limited to content described in specific embodiment above.It is any
Modification without departing from function and structure principle of the invention is intended to be included in the range of claims.
Claims (4)
1. the reactive voltage decentralized coordinated control system based on distributed photovoltaic power, it is characterised in that: including gird-connected inverter,
Several groups reactor, several group capacitors, the gird-connected inverter export quantitative active power using PV control, and by coordination
Control strategy logic distributes reactive power between inverter, reactor group, capacitor group, sets so that grid entry point voltage be made to be maintained at
Determine in range, the coordination control strategy logic are as follows: whether the idle reactive power capability of real-time monitoring inverter is lower than warning line, if
It is that then the reactive power property according to inverter output, is divided into two kinds of situations and carries out different processing modes,
(1) inverter issues reactive power:
The reactor group to put into operation is first detected whether, if so, sequentially cutting out one group of reactance then according to the principle of first in first out
Device, and circulation is reentered after reactor group is cut out；If nothing, all capacitor groups for having put into configuration are detected whether, if
It is then to illustrate to be in extreme situation at this time, system can not put into reactive power compensator further to improve the electricity being likely to occur
Pressure is fallen, therefore according to the adjustment amplitude of setting, the voltage setting value of inverter PV control is turned down, to discharge sizableness in one group
The idle capacity of capacitor carries out pressure regulation；If still there is the capacitor group not put into operation, one group is put into according to advanced principle is first gone out
Capacitor；
(2) inverter absorbing reactive power:
The capacitor group to put into operation is first detected whether, if so, sequentially cutting out one group of capacitor then according to the principle of first in first out
Device, and circulation is reentered after capacitor group is cut out；If nothing, all reactor groups for having put into configuration are detected whether, if
It is then to illustrate to be in extreme situation at this time, system can not put into reactive power compensator further to improve the electricity being likely to occur
Pressure increases, therefore according to the adjustment amplitude of setting, the voltage setting value of inverter PV control is turned up, to discharge sizableness in one group
The idle capacity of capacitor carries out pressure regulation；If still there is the reactor group not put into operation, one group is put into according to advanced principle is first gone out
Reactor.
2. the reactive voltage decentralized coordinated control system according to claim 1 based on distributed photovoltaic power, feature
Be: every group of reactor, the capacity of capacitor are equal, and voltage change caused by the throwing of every group of reactor, capacitor is moved back should not surpass
The 50% of the grid entry point range of regulation set before crossing.
3. the reactive voltage decentralized coordinated control system according to claim 2 based on distributed photovoltaic power, feature
Be: the capacity and inverter Capacity Margin of every group capacitor are close as far as possible.
4. the reactive voltage decentralized coordinated control system according to claim 1 based on distributed photovoltaic power, feature
It is: takes biggish integer divided by every grade of capacity by the capacitor/reactor total capacity configured, determine capacitor/reactor
Switching gear number, and with capacitor/reactor total capacity of this gear number amendment configuration.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09205799A (en) * | 1996-01-24 | 1997-08-05 | Hitachi Ltd | Inverter device |
| CN103944172A (en) * | 2013-08-22 | 2014-07-23 | 南京南瑞集团公司 | Photovoltaic power station reactive voltage control method |
| CN106451535A (en) * | 2016-09-22 | 2017-02-22 | 上海电力学院 | Reactive coordination method based on residual capacity of distributed type power supply grid-connected inverter |
| CN108539786A (en) * | 2018-04-26 | 2018-09-14 | 武汉协鑫新能源电力设计有限公司 | A kind of photovoltaic power station reactive power compensator and method |
-
2018
- 2018-11-14 CN CN201811353101.1A patent/CN109412168A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09205799A (en) * | 1996-01-24 | 1997-08-05 | Hitachi Ltd | Inverter device |
| CN103944172A (en) * | 2013-08-22 | 2014-07-23 | 南京南瑞集团公司 | Photovoltaic power station reactive voltage control method |
| CN106451535A (en) * | 2016-09-22 | 2017-02-22 | 上海电力学院 | Reactive coordination method based on residual capacity of distributed type power supply grid-connected inverter |
| CN108539786A (en) * | 2018-04-26 | 2018-09-14 | 武汉协鑫新能源电力设计有限公司 | A kind of photovoltaic power station reactive power compensator and method |
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