CN105552916B - A kind of system-level control methods of UPFC with the out-of-limit control function of line power - Google Patents
A kind of system-level control methods of UPFC with the out-of-limit control function of line power Download PDFInfo
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- CN105552916B CN105552916B CN201510954745.6A CN201510954745A CN105552916B CN 105552916 B CN105552916 B CN 105552916B CN 201510954745 A CN201510954745 A CN 201510954745A CN 105552916 B CN105552916 B CN 105552916B
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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
Abstract
The invention discloses a kind of system-level control methods of UPFC with the out-of-limit control function of line power, it realizes UPFC section tidal current control functions by section tidal current control strategy, under power network normal operating condition, the actual power of controlled section is controlled below a rational set value of the power rapidly according to dispatch command, ensures that the transmission line of electricity in parallel with controlled section meets that N 1 is checked；Change in failure or operating mode and cause transmission line of electricity on controlled section or transmission line of electricity power connect with controlled section is more prescribed a time limit and is superimposed with a power deviation dP2 that can reflect the out-of-limit situation of circuit as caused by the out-of-limit control module of line power, so as to automatically generate the UPFC control instructions for meeting power network safety operation requirement, the requirement of section tidal current control is met on the premise of circuit nonoverload is preferentially ensured.The present invention had both added the flexibility of scheduling, and and can enough reduces the complexity of operation of power networks, heightens the reliability of operation of power networks.
Description
Technical field
The invention belongs to Power System Flexible transmission ＆ distribution electro-technical field, and in particular to one kind has the out-of-limit control of line power
The system-level control methods of UPFC of function.
Background technology
Power system develops to large-scale interconnected power system, has become becoming jointly for countries in the world modern power systems development
Gesture, and interconnected network is formed such that electric network composition is increasingly complicated, operation is increasingly heavy.To cater to power system development needs,
Flexible AC transmission (flexible AC transmission system, FACTS) technology rapidly develops.Unified Power Flow controls
FACTS device of the device (unified power flow controller, UPFC) as latest generation, can either realize trend
Accurate control, improve the section transmission power limit；And can provides dynamic electric voltage support, improves system voltage stability；Simultaneously
System damping can be improved, improves system dynamic characteristic.Therefore, rationally development of the installing THE UPFC to China's power network
Tool is of great significance.
As shown in figure 1, UPFC is made up of two back-to-back voltage source converters, two back-to-back current transformers share straight
Bus and DC capacitor are flowed, the two is all by converter power transformer access system, and wherein the converter power transformer of current transformer 2 is with shape of connecting
Formula accesses.Active power can flow freely between two current transformers in either direction, the ac output end of each current transformer
Also reactive power can be independently generated or absorbed by.The function of current transformer 2 is to inject width to circuit by series transformer in UPFC
Value and the controllable voltage vector of phase angle, you can while or the selectively voltage on adjusting circuit, impedance and phase angle；Unsteady flow
The active power that the function of device 1 is to provide or absorbed current transformer 2 required on common DC bus, with the injection electricity that maintains to connect
Pressure exchanges with the active power between circuit.In UPFC, except current transformer 2 can carry out active and reactive power exchange with system
Outside, current transformer 1 can also be generated or absorbed by controllable reactive power simultaneously if necessary, and providing independent parallel reactive for circuit mends
Repay.
THE UPFC controls the setting principle of desired value in power network normal operating condition and generation N-1 failures
It is one of difficult point of its Practical.Formulating a set of rational system-level control strategy must be completed before UPFC devices put into operation
Work.Academicly, the research for THE UPFC has focused largely on the side such as UPFC system modellings, power flowcontrol strategy
Face.In engineering, UPFC engineer applied still belongs to blank in China, although external had 3 sets of UPFC devices to put into operation, but still
Lack referential engineering experience.Traditional UPFC devices are directly installed on controlled section, remotely provided by dispatcher by
Section power setting value is controlled, changes in barrier for some reason or operating mode and causes line power more in limited time, it is necessary to which dispatcher remotely changes quilt
Control section power setting value；Under different operating conditions, the controlled section power setting value that dispatcher provides can not ensure circuit
Power is not out-of-limit.This considerably increases the complexity of operation of power networks, the reliability of operation of power networks can be also reduced.Meanwhile by UPFC
The limitation that unit engineering is taken up an area, possibly UPFC can not be installed on controlled section in Practical Project, now need to pass through control
The UPFC devices near controlled section are installed to reach section tidal current control effect.Therefore, formulation is a set of can be with Practical
The system-level control strategies of UPFC with the out-of-limit control function of line power be extremely necessary.
The content of the invention
For the above-mentioned technical problem present in prior art, the invention provides one kind to have the out-of-limit control of line power
The system-level control methods of UPFC of function, meet section tidal current control as far as possible on the premise of circuit nonoverload is preferentially ensured
Requirement, both added the flexibility of scheduling, and can enough reduces the complexity of operation of power networks, heightens the reliability of operation of power networks.
A kind of system-level control methods of UPFC with the out-of-limit control function of line power, by section tidal current control strategy with
The out-of-limit control module of line power is implemented in combination with；The system-level control methods of described UPFC are realized by section tidal current control strategy
UPFC section tidal current control functions, under power network normal operating condition, according to dispatch command rapidly by the actual work(of controlled section
Rate is controlled below a rational set value of the power, ensures that the transmission line of electricity in parallel with controlled section meets that N-1 is checked；In event
The transmission line of electricity power that barrier or operating mode change and cause transmission line of electricity on controlled section or connect with controlled section is more folded in limited time
Plus a power deviation dP2 that can reflect the out-of-limit situation of circuit as caused by the out-of-limit control module of line power, so as to certainly
It is dynamic to generate the UPFC control instructions for meeting power network safety operation requirement, meet on the premise of circuit nonoverload is preferentially ensured
The requirement of section tidal current control.
The detailed process of the section tidal current control strategy is as follows：
1.1 calculate the power deviation dP1 between the setting power of controlled section and actual power；
1.2 by UPFC install the power of circuit, power deviation dP1 and power deviation dP2 it is superimposed after, then through amplitude limit ring
Section obtains UPFC active power command value；
1.3 utilize described active power command value according to the line power factor of setting, calculate UPFC idle work(
Rate command value；
1.4, according to UPFC active power command value and reactive power command value, are entered by relevant control algorithm to UPFC
Row control.
The setting power of section is controlled in described step 1.1 can ensure that the transmission line of electricity in parallel with controlled section meets
N-1 is checked, i.e., when controlled section operates in the setting power, N-1 failures occur for any transmission line of electricity in parallel with controlled section
Afterwards, the power on the parallel transmission line road of other non-faulting is no more than respective power limit.
UPFC reactive power command value is calculated in described step 1.3 by below equation：
The detailed process that the out-of-limit control module of described line power produces power deviation dP2 is as follows：
The actual power of transmission line of electricity or the transmission line of electricity connected with controlled section on the controlled section of 2.1 monitoring, is calculated
Power deviation between the power limit and actual power of each monitored circuit, transported to should be used as each monitored line security
Capable power margin, the minimum value X of all monitored line security operation power margins of extraction；
2.2 determine selection signal Ctrl according to power deviation dP1 and power margin minimum value X by logic judgment；
2.3 determine the input of PI (proportional integration) controller according to described selection signal Ctrl, and then are controlled using PI
Device output produces described power deviation dP2.
Specific logic judgment standard in the step 2.2 is as follows：
1. when under system normal operating condition, the actual power of each monitored circuit is below power limit, then power
Nargin minimum value X is more than 0, now selection signal Ctrl=0；
2. when system occurs N-1 failures or causes monitored circuit overload because of operating mode change, that is, it there are monitored line
The actual power on road is higher than the situation of power limit, then power margin minimum value X is less than 0, now selection signal Ctrl=1；
3. the actual power for exceeding setting power while each monitored circuit when the actual power of controlled section is below
During power limit, then power deviation dP1 is less than 0 and power margin minimum value X and is more than 0, now selection signal Ctrl=0.
In described step 2.3 as selection signal Ctrl=0, then the input signal of PI controllers is 0；Work as selection signal
During Ctrl=1, then the input signal of PI controllers is power margin minimum value X and the default work(of the out-of-limit control module of line power
Rate control nargin PmDifference.
The actual power for exceeding setting power while each monitored circuit when the actual power of controlled section is below work(
During rate limit value, the input signal of selection signal Ctrl=0, PI controller is changed into 0 again, while the integrator in PI controllers is clear
Zero.
Situation 2. with situation 3. under, selection signal Ctrl triggering has certain delay, i.e., continuous multiple moment choosings
Signal Ctrl=0 or 1 is selected, just really the input to PI controllers carries out corresponding selection triggering to selection signal Ctrl.
Under power network normal operating condition, the system-level control strategies of UPFC provided by the invention can be fast according to dispatch command
The actual power control of controlled section is arrived section power setting value by speed, ensures that the transmission line of electricity in parallel with UPFC control sections is expired
Sufficient N-1 is checked；In system jam or operating mode changes what is caused on UPFC control sections or connected with UPFC control sections
When transmission line of electricity overloads, the UPFC control instruction values for meeting power network safety operation requirement are automatically generated, are preferentially ensureing line
Meet the requirement of section tidal current control on the premise of the nonoverload of road as far as possible, the work of safety and stability automatics can be played
With.The present invention had both added the flexibility of scheduling, and and can enough reduces the complexity of operation of power networks, heightens the reliable of operation of power networks
Property, it is significant for UPFC Practical.
Brief description of the drawings
Fig. 1 is UPFC structural representation.
Fig. 2 is the simplification structural representation of certain actual electric network.
Fig. 3 is the control principle schematic diagram of UPFC section tidal current control strategies.
Fig. 4 is the control principle schematic diagram of the out-of-limit control module of UPFC line powers.
Fig. 5 is the control principle schematic diagram of the system-level control strategies of UPFC of the present invention.
Fig. 6 (a) is the work(of section 1 when occurring N-1 failures using HF double loops after the system-level control strategies of UPFC of the present invention
Rate change curve schematic diagram.
Fig. 6 (b) is that HF double loops during N-1 failures occur for HF double loops after using the system-level control strategies of UPFC of the present invention
Changed power curve schematic diagram.
Fig. 7 (a) is that the power of section 1 when N-1 failures occur using section 1 after the system-level control strategies of UPFC of the present invention becomes
Change curve synoptic diagram.
Fig. 7 (b) is the work(of HF double loops when occurring N-1 failures using section 1 after the system-level control strategies of UPFC of the present invention
Rate change curve schematic diagram.
Embodiment
In order to more specifically describe the present invention, below in conjunction with the accompanying drawings and embodiment is to technical scheme
It is described in detail.
Fig. 2 is the simplification structure of certain actual electric network, and region internal loading is mainly powered by section 1 and section 2, two sections
Trend skewness, often meets with transmission bottlenecks.The transmission power of section 1 is about 600MW, HF double loops conveying work(in section 2
Rate is about 780MW, and two transmission cross-sections are unsatisfactory for N-1 checks.I.e.：Any one loop line hinders for some reason in BD or BC double loops exits
After operation, non-fault line power will exceed its power limit；In HF double loops any one loop line hinder for some reason it is out of service after, it is non-
Faulty line power will exceed its power limit.Taken up an area by UPFC system engineerings and limited, BC, BD circuit can not be installed to disconnected
The power of face 1 is directly controlled.Analyzed by comparison and choice, select the installation UPFC devices on AB circuits to enter the power of section 1
Row control, specific control method include：
(1) section tidal current control strategy.
The system-level control strategies of UPFC should ensure that UPFC can realize the demand of its power flowcontrol first.Therefore, power network is normal
Under running status, UPFC should be able to realize its section tidal current function first, i.e., control the transmission power of section 1 in setting value.
UPFC section tidal current control strategies are as shown in Figure 3.
In Fig. 3, PsetAnd PaThe respectively setting value and actual value of the transmission power of section 1；DP1 is that section power controls mould
Block exports, and is assigned to signal A；PLFor AB circuit transmission powers；PmaxAnd PminRespectively AB circuits allow run power the upper limit and
Lower limit；PrefAnd QrefThe respectively control targe value of AB line powers, as UPFC is active and reactive command value；Wherein,δ is power factor.
Under power network normal operating condition, the power flowcontrol strategy formulated can meet UPFC power flowcontrol demands, make to break
The trend of face 1 is controlled in setting value, and now section 2 can meet that N-1 is checked.However, line section power flowcontrol is only used only
Strategy be used as the system-level control strategies of UPFC, barrier for some reason or operating mode change and cause on section 1 line power more to be prescribed a time limit, it is necessary to
Dispatcher remotely changes the setting value of section power；Meanwhile under different operating conditions, the setting value that dispatcher provides can not protect
Card can control line power below its power limit, and this considerably increases the complexity of operation of power networks, can also reduce power network
Reliability of operation.
(2) the out-of-limit control strategy of line power.
To reduce the complexity of operation of power networks, the reliability of operation of power networks is improved, changes in barrier for some reason or operating mode and draws
Rise section 1 on line power more prescribe a time limit the system-level control strategies of UPFC should be able to automatically generate meet power network safety operation will
The UPFC command values asked.Therefore, the out-of-limit control of line power as shown in Figure 4 is added on the basis of section tidal current control strategy
Molding block, specific control process are as follows：
The actual power of transmission line of electricity on 2.1 monitoring sections 1, calculate the power limit and actual value of each monitored circuit
Between power deviation, will each monitored line security operation as the margin index of each monitored line security operation
The minimum value of margin index is assigned to signal B；
Inputs of the 2.2 signal A and signal B as trigger module, it is common to generate the out-of-limit control module PI controls of line power
The input select signal Ctrl of device.Its control logic is as follows：1. under system normal operating condition, monitored line power is below
Its power limit, i.e. B>0, now Ctrl=0, the input signal of PI controllers is 0；2. when N-1 failures occur for system or because of work
When condition change causes any one monitored circuit overload, i.e. B<0, now Ctrl=1, the input signal of PI controllers are changed into energy
Enough reflect the power deviation signal of the out-of-limit situation of circuit；3. when controlled section tidal current exceedes its setting value monitored circuit work(simultaneously
Rate is below its power limit, i.e. A<0 and B>0, now CTRL=0, the input signal of PI controllers are changed into 0, while PI again
The integrator of controller is reset.To prevent trigger module frequent movement, the 2. and 3. triggering of middle Ctrl signals and returning is passed through
Certain time delay, persistently meet that control logic can just cause the triggering or return of Ctrl signals in the when Yanzhong of setting.
2.3 also have certain nargin to ensure that monitored circuit runs power apart from its power limit, are inputted in PI controllers
Link adds PmControl nargin of the signal as the out-of-limit control module of line power；The output of PI controllers is that line power is got over
Limit the output dP2 of control module.
In Fig. 4, Plimt1And Plimit2Respectively BC, BD line power limit value；Pline1And Pline2Respectively BC, BD circuit are real
Border power.
(3) the system-level control strategies of UPFC.
Comprehensive section tidal current control strategy presented above and the out-of-limit control strategy of line power.Present embodiment proposes
A set of system-level control strategies of UPFC for both having met system load flow demand for control while there is the out-of-limit control ability of line power, tool
Body is as shown in Figure 5：
Under 3.1 system normal operating conditions, if the circuit of monitoring does not overload always, the out-of-limit control module of line power is defeated
Go out and produced for 0, UPFC control targes by section power control module, ensure that section actual power reaches setting value.
3.2 after certain line overload is monitored, the out-of-limit control module output of line power can reflect the out-of-limit situation of circuit
Power deviation signal.The control instruction value of UPFC devices is total to by section power control module and the out-of-limit control module of line power
With generation.In the presence of the out-of-limit control module PI controllers of line power, power deviation signal dP2 will play a leading role.This
When, the control instruction value of the system-level control strategy generations of UPFC limits the preferential power for ensureing monitored circuit less than its power
Value.
Section set value of the power is provided by a dispatcher distant place in 3.3 system control strategies, as section power is also not up to set
During definite value, there is the circuit overload monitored, then to monitor circuit nonoverload as priority acccess control target, can both increase the spirit of scheduling
Activity, the reliability of operation of power networks will not be endangered again.When UPFC installs circuit overload, priority acccess control UPFC installation line powers
No more than its power limit.
The transmitted power setting value P of section 1 in the system-level control strategy that present embodiment is formulatedset, will for 750MW
HF double loops power flow transfer ensures that HF double loops meet that N-1 is checked to section 1.BC, BD line power limit value Plimt1And Plimit2
It is 45MW；The control nargin P of the out-of-limit control module of line powermFor 2MW；AB circuits allow the upper and lower bound for running power
PmaxAnd PminRespectively 45MW and -45MW；The input select signal Ctrl of the out-of-limit control module PI controllers of line power is initial
It is worth for 0, its delay for triggering and returning is 0.5s；AB line powers set power factor as 0.98.The out-of-limit control of line power
The gain of proportional amplifier and integrator is respectively 0.4 and 1.0 in molding block PI controllers.
Under the system-level control strategy that present embodiment is formulated, section 1 and HF during N-1 failures occur for HF double loops
The changed power curve of double loop is as shown in Figure 6.When three-phase ground failure occurs for 1 loop line in HF double loops, to ensure
UPFC equipment safeties, the conducting of transformer by-pass switch bypasses series side transverter, after failure removal, to ensure UPFC devices
Safety, UPFC puts into operation again after setting time (1s).Simulation process is as follows：The system-level control strategies of UPFC are thrown during 2s
Enter；Three-phase ground failure occurs for HF loop lines road during 5s, and UPFC is out of service；HF1 loop lines road disconnects during 5.1s, failure removal；
UPFC will be put into again during 6.1s.
Under the system-level control strategy that present embodiment is formulated, it is double that section 1 and HF during N-1 failures occur for section 1
The changed power curve of loop line is as shown in Figure 7.Simulation process is as follows：UPFC system-level control strategy inputs during 2s；BD lines during 5s
Three-phase ground failure occurs for road, and UPFC is out of service；BD circuits disconnect during 5.1s, failure removal；UPFC will be thrown again during 6.1s
Enter.
It can be seen from figures 6 and 7 that under power network normal operating condition, system-level control that present embodiment is formulated
The actual power control of section 1 can be arrived section power setting value (750MW) by system strategy rapidly；When N-1 occurs for HF double loops
During failure, the Power Control of section 1 can be ensured that HF double loops meet that N-1 is checked in 750MW；Led when N-1 failures occur for section 1
When causing non-fault line overload, the system-level control strategy formulated can automatically generate new UPFC command values, preferentially protect
Meet the requirement of section tidal current control on the premise of card non-fault line nonoverload as far as possible.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using this hair
It is bright.Person skilled in the art obviously can easily make various modifications to above-described embodiment, and described herein
General Principle is applied in other embodiment without by performing creative labour.Therefore, the invention is not restricted to above-described embodiment,
For those skilled in the art according to the announcement of the present invention, the improvement made for the present invention and modification all should be in the protections of the present invention
Within the scope of.
Claims (1)
- A kind of 1. system-level control methods of UPFC with the out-of-limit control function of line power, it is characterised in that：The UPFC systems Level control method is implemented in combination with by section tidal current control strategy and the out-of-limit control module of line power；It is controlled by section tidal current Strategy realizes UPFC section tidal current control functions, under power network normal operating condition, according to dispatch command rapidly by controlled section Actual power control below a rational set value of the power, the guarantee transmission line of electricity in parallel with controlled section meets N-1 Check；Change in failure or operating mode and cause transmission line of electricity on controlled section or the transmission line of electricity power connected with controlled section More it is superimposed with a power deviation that can reflect the out-of-limit situation of circuit as caused by the out-of-limit control module of line power in limited time DP2, so as to automatically generate the UPFC control instructions for meeting power network safety operation requirement, preferentially ensureing circuit nonoverload Under the premise of meet section tidal current control requirement；The detailed process of the section tidal current control strategy is as follows：1.1 calculate the power deviation dP1 between the setting power of controlled section and actual power；The setting power energy of controlled section It is enough to ensure that the transmission line of electricity in parallel with controlled section meets that N-1 is checked, i.e., it is any when controlled section operates in the setting power After N-1 failures occur for the transmission line of electricity in parallel with controlled section, the power on the parallel transmission line road of other non-faulting is no more than Respective power limit；1.2 by UPFC install the power of circuit, power deviation dP1 and power deviation dP2 it is superimposed after, then obtain through amplitude limit link To UPFC active power command value；1.3 utilize described active power command value according to the line power factor of setting, and UPFC is calculated by below equation Reactive power command value；1.4, according to UPFC active power command value and reactive power command value, are controlled by relevant control algorithm to UPFC System；The detailed process that the out-of-limit control module of described line power produces power deviation dP2 is as follows：The actual power of transmission line of electricity or the transmission line of electricity connected with controlled section on the controlled section of 2.1 monitoring, is calculated each Power deviation between the power limit and actual power of monitored circuit, to should be used as each monitored line security operation Power margin, the minimum value X of all monitored line security operation power margins of extraction；2.2 determine selection signal Ctrl according to power deviation dP1 and power margin minimum value X by logic judgment, specifically patrol It is as follows to collect criterion：1. when under system normal operating condition, the actual power of each monitored circuit is below power limit, then power margin Minimum value X is more than 0, now selection signal Ctrl=0；2. when system occurs N-1 failures or causes monitored circuit overload because of operating mode change, that is, it there are monitored circuit Actual power is higher than the situation of power limit, then power margin minimum value X is less than 0, now selection signal Ctrl=1；3. the actual power for exceeding setting power while each monitored circuit when the actual power of controlled section is below power During limit value, then power deviation dP1 is less than 0 and power margin minimum value X and is more than 0, now selection signal Ctrl=0；2.3 determine the input of PI controllers according to described selection signal Ctrl, and then using described in the output generation of PI controllers Power deviation dP2；As selection signal Ctrl=0, then the input signal of PI controllers is 0；As selection signal Ctrl=1 When, then the input signal of PI controllers is power margin minimum value X and the default Power Control of the out-of-limit control module of line power Nargin PmDifference；The actual power for exceeding setting power while each monitored circuit when the actual power of controlled section is below power limit During value, the input signal of selection signal Ctrl=0, PI controller is changed into 0 again, while the integrator in PI controllers is reset；Situation 2. with situation 3. under, selection signal Ctrl triggering has certain delay, i.e., continuous multiple moment selection letters Just really the input to PI controllers carries out corresponding selection triggering by number Ctrl=0 or 1, selection signal Ctrl.
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| CN106026101B (en) * | 2016-06-29 | 2020-05-19 | 许继集团有限公司 | Double-circuit line unified power flow controller and multi-section power flow control method |
| CN106026102B (en) * | 2016-06-29 | 2020-05-26 | 许继集团有限公司 | Double-circuit line unified power flow controller and section power flow control method |
| CN106208083B (en) * | 2016-10-09 | 2018-09-07 | 国网河北省电力公司 | A kind of method and device obtaining THE UPFC configuration |
| CN106953320B (en) * | 2017-03-31 | 2019-05-07 | 国网江苏省电力公司 | A kind of transmission line of electricity overload controlling method based on UPFC |
| CN108306300B (en) * | 2018-01-30 | 2020-09-01 | 中国电力科学研究院有限公司 | Method and system for determining capacity of unified power flow controller on main network section |
| CN111276991A (en) * | 2020-01-15 | 2020-06-12 | 南京南瑞继保电气有限公司 | Power transfer device between circuit suitable for multiunit multi-circuit line |
| CN111884228A (en) * | 2020-07-31 | 2020-11-03 | 广东电网有限责任公司 | UPFC control strategy considering regional renewable energy consumption |
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