CN105914741B - A kind of line side UPFC reactive power flow optimal control method - Google Patents
A kind of line side UPFC reactive power flow optimal control method Download PDFInfo
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- CN105914741B CN105914741B CN201610371206.4A CN201610371206A CN105914741B CN 105914741 B CN105914741 B CN 105914741B CN 201610371206 A CN201610371206 A CN 201610371206A CN 105914741 B CN105914741 B CN 105914741B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 7
- 230000005611 electricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
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- 230000001105 regulatory effect Effects 0.000 description 2
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Classifications
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
-
- 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
- Y02E40/10—Flexible AC transmission systems [FACTS]
Abstract
The present invention relates to a kind of line side UPFC reactive power flow optimal control method, core concept is provided for the reactive loss of route by UPFC, and sending end and receiving end power grid do not provide reactive power.The reactive loss of route is calculated according to line current virtual value and electric network impedance, is instructed as the line reactive power of UPFC series side converter；The reactive power of sending end power grid is made the difference with zero, closed-loop control is carried out to it, obtains the reactive power instruction of side inverter in parallel；This method can enhance UPFC to the control ability of route effective power flow, and UPFC provides reactive power for route, reduces influence of the route reactive loss to network voltage, improves the stability of sending end and receiving end power grid in the case where UPFC capacity is certain.
Description
Technical field
The present invention relates to a kind of line side UPFC reactive power flow optimal control methods, belong to Power System Flexible transmission of electricity neck
Domain.
Background technique
THE UPFC (unified power flow controller, UPFC) is based on voltage source converter
Series and parallel mixed type FACTS device, can quick, flexible, continuous adjusting circuit trend, improve Section Tidal Current of Power Transmission point
The phenomenon of cloth unevenness, improves the utilization efficiency of transmission line of electricity, can also to power grid inject reactive power, systems stabilisation node voltage,
Improve power supply reliability.
Line Flow control system is as shown in Figure 1, by shunt transformer, parallel inverter, series transformer, the series connection change of current
The composition such as device and by-pass switch.Parallel inverter is used to stablize the DC bus-bar voltage of inverter, and injects or absorb to power grid
Reactive power；Inverter connect by adjusting its output voltage vector amplitude and phase, changes the active and reactive power flow of route.
For the problem that the instruction of UPFC series side Line Flow is given, traditional Line Flow control method is active tide
Stream instruction is issued according to load, the operating condition of route etc. of system by dispatcher；Reactive power flow instruction is given as zero.Using
When this reactive power flow controls, UPFC reduces the regulating power of route effective power flow, and the reactive loss of route is by receiving end electricity
Source provides, and the stability of idle being absorbed by sending end power supply of UPFC series side output, sending end and receiving end network voltage reduces, furthermore
The active power that UPFC series side and top-cross in parallel are changed is big.
Summary of the invention
The object of the present invention is to provide a kind of line side UPFC reactive power flow optimal control methods, to enhance UPFC to line
The control ability of road effective power flow reduces influence of the reactive power of route reactive loss and UPFC output to network voltage, mentions
The stability of high sending end and receiving end network voltage, and reduce the active power that UPFC series side is changed with top-cross in parallel.
A kind of line side UPFC reactive power flow optimal control method, including
The control of UPFC series side converter: the line reactive power of UPFC series side inverter is instructed according to line current
Virtual value and line impedance are calculated；
UPFC parallel connection side converter Control: the reactive power of UPFC parallel connection side inverter is instructed according to the idle of sending end power grid
Power closed-loop control obtains.
Further, the line reactive power instruction calculation method of the UPFC series side is Qref_se=3Ilrms 2XR, formula
In: XRFor line impedance, IlrmsFor line current virtual value.
Further, the reactive power instruction of the side in parallel inverter is done according to the reactive power of sending end power grid with zero
Difference is obtained using pi regulator closed-loop control.
Present contribution to the art essentially consists in the control mode of series side.It is controlled when using line reactive power
When being zero, there are regulating power of the UPFC to route effective power flow to decline, and sending end and receiving end Network Voltage Stability reduce, UPFC
The big problem of the active power that series side and top-cross in parallel are changed, therefore Line Flow control method provided by the invention is with following
Advantage: UPFC is improved to the control ability of route effective power flow, enhances sending end and receiving end voltage stability, UPFC series side
The active power changed with top-cross in parallel is small, and realizes simple.
Detailed description of the invention
Fig. 1 is Line Flow control system schematic diagram；
Fig. 2 is Line Flow control equivalent circuit；
Fig. 3 is Line Flow control polar plot；
Fig. 4 is line reactive power optimal control block diagram；
Fig. 5 is the comparison diagram of the present invention mentioned line side reactive power flow optimisation strategy and conventional measures.
Specific embodiment
The line side UPFC reactive power flow optimal control method provided by the invention the following steps are included:
(1), it is instructed according to the line reactive power that UPFC series side is calculated in line current virtual value and line impedance；
(2), the reactive power that the reactive power closed-loop control of sending end power grid obtains UPFC parallel connection side inverter is instructed.
As shown in figure 4, specifically, the line reactive power instruction calculation method of the UPFC series side is Qref_se=
3Ilrms 2XR, in formula: XRFor line impedance, IlrmsFor line current virtual value.The reactive power instruction of parallel connection side inverter
It is made the difference according to the reactive power of sending end power grid with zero, is obtained using pi regulator closed-loop control.
Qref_se=3Ilrms 2XRIt is fundamental formular, as other embodiments, it can also be deformed to obtain other
Formula.
The control method is specifically described below:
After UPFC is added, the equivalent circuit of transmission line of electricity is as shown in Fig. 2, with sending end power grid phase voltage v1On the basis of, system
Polar plot as shown in figure 3, sending end voltage v1, route v2Point and receiving end voltage vRDq axis component be respectively
In formula: V1For sending end power grid phase voltage virtual value, VRFor receiving end power grid phase voltage virtual value, V12For UPFC series side
The virtual value of incoming line voltage distribution, θ12For UPFC series side output voltage phase, δ is sending end network voltage and receiving end network voltage
Phase difference.
The dq axis component of line current is
Sending end power network current i1Dq axis component be
Wherein XRFor line impedance, ishdFor the d shaft current of UPFC parallel connection side, ishqFor the q shaft current of UPFC parallel connection side.
The power of UPFC series side is
The active power of line transmission is
The reactive power of sending end power grid is
The reactive power of receiving end power grid is
Route v2Point reactive power be
Line reactance consumes idle by power supply v1、v12And vRIt is common to provide, such as following formula
QL=-(QR+Q1+Q12) (11)
Traditional UPFC control method is by route v2The Reactive Power Control of point is zero
Q2=0 (12)
It can be in the hope of the angle of UPFC series side output voltage is when reducing line transmission active power
The angle of UPFC series side output voltage is when promoting route transmitting active power
UPFC control program proposed in this paper is by route v2The Reactive Power Control of point is the reactive loss of route, i.e.,
Q2=QL (15)
It can be in the hope of the angle of UPFC series side output voltage is when reducing line transmission power
The angle of UPFC series side output voltage is when promoting route transmitting active power
The capacity of UPFC is
S=3V12Ilrate (18)
Wherein IlrateFor route rated current.
It is derived according to above, when using two different control strategies, UPFC is to the change ability of route effective power flow, right
The active power that the influence of sending end and receiving end power supply and UPFC series side and top-cross in parallel are changed is as shown in Figure 5.
When carrying out Line Flow control, advantage of the mentioned line reactive power optimisation strategy of the present invention compared with conventional measures
For, when changing identical Line Flow, required UPFC capacity is smaller, and the reactive loss of route is provided by UPFC, sending end and
For receiving end power supply without output or absorbing reactive power, Network Voltage Stability is more preferable, and UPFC series side and top-cross in parallel are changed
Active power is smaller.
The control program of UPFC mainly includes two parts, i.e., different reactive power flows is respectively adopted to series side and side in parallel
Instruction: for series side, the reactive loss of route being calculated according to line current virtual value and line impedance, as
The line reactive power of UPFC series side inverter instructs.For side in parallel, the reactive power of sending end power grid and zero are made the difference, it is right
It carries out closed-loop control, obtains the reactive power flow instruction of side inverter in parallel.The present invention is the main contributions of the prior art
The control of series side controls side in parallel, can also use other control strategies in the prior art.
Claims (2)
1. a kind of line side UPFC reactive power flow optimal control method, it is characterised in that: including
The control of UPFC series side converter: the line reactive power instruction of UPFC series side inverter is effective according to line current
Value and line impedance are calculated；The line reactive power instruction calculation method of the UPFC series side is Qref_se=
3Ilrms 2XR, in formula: XRFor line impedance, IlrmsFor line current virtual value；
UPFC parallel connection side converter Control: the reactive power of UPFC parallel connection side inverter instructs the reactive power according to sending end power grid
Closed-loop control obtains.
2. the line side UPFC reactive power flow optimal control method according to claim 1, which is characterized in that the parallel connection side
The reactive power instruction of inverter makes the difference according to the reactive power of sending end power grid with zero, is obtained using pi regulator closed-loop control.
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| CN201610371206.4A CN105914741B (en) | 2016-05-30 | 2016-05-30 | A kind of line side UPFC reactive power flow optimal control method |
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| CN201610371206.4A CN105914741B (en) | 2016-05-30 | 2016-05-30 | A kind of line side UPFC reactive power flow optimal control method |
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| CN105914741B true CN105914741B (en) | 2018-12-07 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106356854B (en) * | 2016-09-14 | 2018-09-11 | 中国能源建设集团江苏省电力设计院有限公司 | A kind of UPFC Voltage Stability Control strategies based on control mode switch |
| CN106208091B (en) * | 2016-09-14 | 2018-10-30 | 中国能源建设集团江苏省电力设计院有限公司 | A kind of PV control methods for UPFC series sides |
| CN106953336B (en) * | 2017-03-31 | 2019-05-07 | 国网江苏省电力公司 | A kind of ac bus voltage adjusting method based on UPFC |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1668245B1 (en) * | 2003-09-25 | 2010-11-10 | REpower Systems AG | Wind power plant comprising a reactive power module for supporting a power supply system and corresponding method |
| CN103560520A (en) * | 2013-11-11 | 2014-02-05 | 山东大学 | Unified power quality controller suitable for fault ride-through and control method |
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- 2016-05-30 CN CN201610371206.4A patent/CN105914741B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1668245B1 (en) * | 2003-09-25 | 2010-11-10 | REpower Systems AG | Wind power plant comprising a reactive power module for supporting a power supply system and corresponding method |
| CN103560520A (en) * | 2013-11-11 | 2014-02-05 | 山东大学 | Unified power quality controller suitable for fault ride-through and control method |
Non-Patent Citations (1)
| Title |
|---|
| 用于UPFC的串、并联双变流器控制策略研究;朱鹏程;《中国优秀博硕士学位论文全文数据库 (博士)工程科技Ⅱ辑（月刊）》;20060515;第124-156页 * |
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