CN105024378B - The AGC control methods of direct power supply isolated power network system - Google Patents
The AGC control methods of direct power supply isolated power network system Download PDFInfo
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Abstract
The AGC control methods of direct power supply isolated power network system, it is characterised in that：Direct power supply isolated power network adjustable frequency is subjected to staged and layered grading control, the division of labor of frequency is controlled to the execution equipment of net interior power side and load side；It is configured particular by mains side primary frequency modulation, power-management centre AGC frequency modulation frequency modulations, load side frequency control system, network system frequency is adjusted jointly by 3 points of mains side network load side for completion.This method is good to direct power supply isolated power network system regulation effect, realizes non differential regulation.
Description
Technical field
The present invention relates to the AGC control methods of power system, and in particular to a kind of isolated power network system of power supply direct-furnish electric charge
The AGC control methods of system.
Background technology
Certain industrial park is completed 2 × 450,000 tons of Aluminum Electrolysis Production lines, and auxiliary construction 6 × 350MW thermal power generation units,
Employ direct power supply grid mode of the large-sized unit to big type groove.Direct power supply isolated power network system is due to first stage of construction automatic generation control
Unit processed is less, and the fm capacity of unit is limited, causes direct power supply isolated power network more fragile, when mains side or load side are run
Device fails, accident treatment is improper may to cause mains breakdown.
Power-management centre AGC controls FFC patterns using constant frequency, and control targe is to maintain system frequency permanent
It is fixed.But in the independent grid structure of the big big load of power supply direct-furnish, routinely AGC control models easily cause mains side frequency modulation unit
Interlock reforming phenomena with AGC controling powers；Frequency stabilization control in the case of power grid accident can not reversely be met by easily causing active force and effect
System；The frequent movement of the generating set pitch of operation can not be mitigated, the fluctuation up and down of mains frequency is resulted even in, to power network
Safe operation brings threat.
AGC control technologies are used in big power supply into big load direct power supply isolated power network system and play its efficiency simultaneously at present
Beyond example.
The content of the invention
The present invention provides the AGC control methods of direct power supply isolated power network system, in direct power supply isolated power network rack system,
Power network adjustable frequency is subjected to staged and layered grading control, frequency is controlled to the execution equipment of net interior power side and load side
The division of labor of rate；Enter the division of line range to frequency modulation equipment access point, each helpless regulation dead bands of each role of layer at different levels are entered
The optimization of row control strategy.
The present invention is achieved by the following technical solutions：The AGC control methods of direct power supply isolated power network system, its feature
It is, comprises the following steps：
1）Mains side primary frequency modulation：The automatic-generation-control unit of mains side is responded into spy according to the closed-loop control of AGC monomers
Property is divided into the first frequency modulation unit, the second frequency modulation unit, the 3rd frequency modulation unit, and the Regulation dead-band scope of the first frequency modulation unit is set
50 ± 0.4Hz is set to, the Regulation dead-band scope of the second frequency modulation unit is arranged to 50 ± 0.47Hz, the 3rd frequency modulation unit
Regulation dead-band scope be arranged to 50 ± 0.5Hz；
2）Power-management centre AGC frequency modulation frequency modulations：Set power-management centre AGC control access Frequency point for 50 ±
0.4Hz；System frequency frequency oscillation caused by by the instruction control of multiple frequency modulation can be avoided.Power-management centre AGC control
Mode controls FFC using constant frequency, only detects frequency departure, and what this control mode finally maintained is system frequency perseverance
Determine, i.e. Δ f=0, it is then uncontrolled to the exchange power on interconnection.
3）For accident conditions lower frequency in the range of 50 ± 0.4Hz, mains side primary frequency modulation and control centre AGC bis- times
Frequency modulation is all not involved in the frequency suspension problem in the case of control, and frequency modulation control is participated in automatically by load side frequency control system；
4）Suspend and ask for frequency of the accident conditions lower frequency in the range of 48.8Hz~49.6Hz, 50.4~51.2Hz
Topic, by safety stabilization control system according to network system power shortage or more than needed, control is implemented to controllable unit or load；The mistake
Unit mains side primary frequency modulation, control centre's AGC frequency modulation frequency modulations, load side frequency control system all participate in regulation in journey, altogether
With maintaining the stabilization of system frequency.
5）For frequency suspension problem of the accident conditions lower frequency more than 50 ± 1.2Hz scopes, it is low to start load side low frequency
Machine control is cut in pressure Control of decreasing load and the high week protection of mains side generator；Frequency fluctuates frequent, unit during being somebody's turn to do up and down during implementation
Primary frequency modulation, AGC frequency modulation frequency modulations, negative load side frequency control system all participate in regulation, maintains the steady of system frequency jointly
It is fixed.In dynamic test, the Time And Frequency Primary regulation that the effect of frequency Secondary Control plays starts the time progressively lost
Substantially quite, both coordinate very well in time, and quick recovery system frequency serves important when occurring system compared with large disturbances
Effect.
AGC control systems data are obtained and are built upon on EMS data acquisition analysis system SCADA platforms, generator
Group coordinated control system and scheduling data information transfer system by remote measurement, remote signalling input element, computer disposal link and
It is remotely controlled the Remote closed loop control system that output element forms power production process.
AGC control units are all based on one's respective area Grid control error ACE and make regulation, and its calculation formula is：ACE JS =10*B*（f-f 0 ）,
Wherein：BField frequency deviation factor, unit：MW/0.1Hz
f Practical frequency, unit：Hz
f 0 Rated frequency, unit：Hz
After pool off-grid, the electric network source side primary frequency modulation can low imperial frequency normal fluctuation determine 50
In the range of ± 0.4Hz, the controllable frequency of electricity net safety stable system is in the range of 50 ± 1.2Hz, beyond 50 ± 1.2Hz points
The fluctuation of mains frequency is not balanced by load side low-frequency low-voltage load shedding and the high all defencive functions of mains side generator.
The regulation of network system frequency is completed jointly by source -3 points of net-lotus：It is to lean on more units of mains side once first
The quick response of frequency modulation function is completed；Next to that suspension frequency is drawn by power-management centre AGC frequency modulation frequency modulations function
Return in the range of 48.8Hz~49.6Hz, 50.4~51.2Hz；Gradually make Power Plant primary frequency modulation by AGC frequency modulation functions again
Action slows down until FREQUENCY CONTROL is in the range of 50 ± 0.2Hz；The blind area of control for AGC and force AGC controls and cause system
Hunting of frequency is special to introduce load side frequency control system frequency regulation technology, to solve frequency suspension problem beyond AGC controls.
Brief description of the drawings
AGC control methods frequency regulation flow process figure in Fig. 1 embodiments.
Embodiment
With reference to embodiment, the invention will be described in further detail.
The present embodiment is application of the thermal power generation unit to AGC control methods in large scale electrolytic cell direct power supply network system,
Operational mode is：In two 350MW generating sets input AGC control systems, a generating set AGC control input controls on the spot
Pattern is both in emergency circumstances can be with manual intervention.
First, AGC control systems regulation and control step is set：
Solve net：Switched off grid-connected, depart from steel mesh, form the aluminium net control mode of direct power supply, system frequency is by stable state
Into fluctuation status, large disturbances dynamic test is carried out respectively in mains side, load side, verifies the frequency stabilization function of AGC frequency modulation frequency modulations
And parameter and unit primary frequency modulation matching relationship.
1）Mains side primary frequency modulation：The automatic-generation-control unit of mains side is responded into spy according to the closed-loop control of AGC monomers
Property is divided into the first frequency modulation unit, the second frequency modulation unit, the 3rd frequency modulation unit, and the Regulation dead-band scope of the first frequency modulation unit is set
50 ± 0.4Hz is set to, the Regulation dead-band scope of the second frequency modulation unit is arranged to 50 ± 0.47Hz, the 3rd frequency modulation unit
Regulation dead-band scope be arranged to 50 ± 0.5Hz.
2）Power-management centre AGC frequency modulation frequency modulations：Set power-management centre AGC control access Frequency point for 50 ±
0.4Hz.Power-management centre AGC control mode controls FFC (Flat frequency using constant frequency
Control), frequency departure is only detected, what this control mode finally maintained is that system frequency is constant, i.e. Δ f=0, to interconnection
On exchange power it is then uncontrolled.
3）For accident conditions lower frequency in the range of 50 ± 0.4Hz, mains side primary frequency modulation and control centre AGC bis- times
Frequency modulation is all not involved in the frequency suspension problem in the case of control, and frequency modulation control is participated in automatically by load side frequency control system.
4）Suspend and ask for frequency of the accident conditions lower frequency in the range of 48.8Hz~49.6Hz, 50.4~51.2Hz
Topic, by safety stabilization control system according to network system power shortage or more than needed, control is implemented to controllable unit or load.
5）For frequency suspension problem of the accident conditions lower frequency more than 50 ± 1.2Hz scopes, it is low to start load side low frequency
Machine control is cut in pressure Control of decreasing load and the high week protection of mains side generator；AGC units are all based on one's respective area power network ACE（Area
Control Error）And regulation is made, ACE area control errors, its calculation formula is：ACE JS =10*B*（f-f 0 ）, wherein：
BField frequency deviation factor,（Unit：MW/0.1Hz）
f Practical frequency（Unit：Hz）
f 0 Rated frequency（Unit：Hz）
When AGC control systems input constant frequency control FFC modes under direct power supply control model, when mains side or load
The magnitude of AGC control systems detection frequency, isolated power network practical frequency fall 0.1Hz loads and reduce 9MW under the accident conditions of side,
According to ACE calculation formulaACE JS =10*B*（f-f 0 ）, control error in region can be obtained, electricity is controlled by AGC control systems
Brand-name computer group generation load amount meets power network electricity demand.
AGC control systems put into constant Tie line Power Control FTC modes under networking control pattern, according to ACE
Calculation formulaACE JS =（I-I 0 ）Control error in region can be obtained, controls Power Plant to generate electricity by AGC control systems negative
Lotus amount meets power network electricity demand.Wherein：IIt is the actual trend power sum of region interconnection（MW）,I 0 It is that regional planning is net
Exchange power（MW）.
2nd, AGC control systems information exchange situation：
AGC control systems data are obtained and are built upon on EMS data acquisition analysis system SCADA platforms, generator
Group coordinated control system and scheduling data information transfer system by remote measurement, remote signalling input element, computer disposal link and
It is remotely controlled the Remote closed loop control system that output element forms power production process.
AGC control system information exchange situations such as following table：
3rd, AGC control systems main website major parameter is set as follows：
Frequency deviation coefficient（MW/0.1Hz）：The parameter plays vital effect to the dynamic process of AGC control systems.Directly
Power supply grid system operation mode is 2 350MW unit operations, and unit always generates electricity 700MW, 2% setting always to be generated electricity by system
Frequency deviation coefficient is 14MW/Hz.
The dead band of ACE control systems：When ACE control systems exceed this value, AGC control systems enter normal adjust from dead band
Save region.Active force and mains side primary frequency modulation handing-over of the parameter to AGC control system functions plays vital effect.
With reference to mains side primary frequency modulation dead band and mains side primary frequency modulation movement range, it is defined as 9 MW/0.1Hz.
The discrete filter factor：Low-pass first order filter is adopted in load side frequency control system come filter certain amount of high frequency with
Machine component, these high frequency random components are often as caused by noise and other random fluctuations.The parameter setting is 0.2, solution
Certainly suspension effect is strengthened.
The factors such as frequency bias coefficient and the part throttle characteristics in system, the performance of machine unit speed regulating device are relevant, and these factors
It is not a constant in the range of whole service, thus comprehensive system response coefficient is also no a constant.
Occur in current control system with constant, be simply suitable in certain range of operation, it should be noted that amendment in time, with
Improve the dynamic quality of control.
4th, the drop test data of system frequency：
It is that then frequency deviation coefficient is 9MW/0.1Hz to 9MW/0.1HZ AGC from grid structure actual measurement, ACE dead bands are 12MW, also
Be say when system frequency fall for 49.8 when, AGC participate in adjustment.
Suspension time is when 1 minute between 49.6Hz -50.4Hz for frequency, by the negative of the automatic plus/minus 2MW of DCS system
Lotus amount, alleviate influence of the primary frequency modulation frequent movement to main inlet throttle-stop valve；Frequency is in the outstanding of below 49.6Hz or 50.4Hz frequencies above
It is floating to be completed by control centre's AGC frequency modulation frequency modulations；Frequency is completed in below 49.3Hz by load side primary frequency modulation；Frequency exists
Below 49.0Hz maintains net frequency in more than 51.2Hz by load side low-frequency low-voltage load shedding, the high week protection of mains side generator
It is constant.
After the completion of adjusting parameter optimal design-aside, in load side electrolytic aluminium pressure/liter critical 18%（62.10~63.00MW）Load
In fluctuation and mains side 350MW units RB experiments, Power Plant Side primary frequency modulation unit, control centre's AGC FREQUENCY CONTROLs, load side are adjusted
Frequency controls effectively control primary frequency modulation to act frequently problem, solves different frequency band frequency in the case of various failures and suspends and asks
Topic.
Claims (3)
1. the AGC control methods of direct power supply isolated power network system, it is characterised in that comprise the following steps：
1）Mains side primary frequency modulation：By the automatic-generation-control unit of mains side according to AGC monomer closed-loop controls response characteristic point
For the first frequency modulation unit, the second frequency modulation unit, the 3rd frequency modulation unit, the Regulation dead-band scope of the first frequency modulation unit is arranged to
50 ± 0.4Hz, the Regulation dead-band scope of the second frequency modulation unit are arranged to 50 ± 0.47Hz, the tune of the 3rd frequency modulation unit
Frequency dead zone range is arranged to 50 ± 0.5Hz；
2）Power-management centre AGC frequency modulation frequency modulations：It is 50 ± 0.4Hz to set power-management centre AGC to control access Frequency point；Electricity
Power control centre AGC control mode controls using constant frequency FFC；
3）For accident conditions lower frequency in the range of 50 ± 0.4Hz, the mains side primary frequency modulation and the control centre AGC
Frequency modulation frequency modulation is all not involved in the frequency suspension problem in the case of control, and frequency modulation control is participated in automatically by load side frequency control system
System；
4）For frequency suspension problem of the accident conditions lower frequency in the range of 48.8Hz~49.6Hz, 50.4~51.2Hz, by
Safety stabilization control system implements control according to network system power shortage or more than needed to controllable unit or load；
5）For frequency suspension problem of the accident conditions lower frequency more than 50 ± 1.2Hz scopes, start load side low-frequency and low-voltage and subtract
Carry control and machine control is cut in the high week protection of mains side generator.
2. the AGC control methods of direct power supply isolated power network system as claimed in claim 1, it is characterised in that：Step 2,3,4,5
Middle AGC control systems are to make regulation based on one's respective area Grid control error ACE, the area control error ACE meters
Calculating formula is：ACE JS =10*B*（f-f 0 ）, wherein：
BField frequency deviation factor, unit：MW/0.1Hz
f Practical frequency, unit：Hz
f 0 Rated frequency, unit：Hz.
3. the AGC control methods of direct power supply isolated power network system as claimed in claim 1 or 2, it is characterised in that：AGC is controlled
System data obtain be built upon on EMS data acquisition analysis system SCADA platforms, generator group coordination and control system with
And scheduling data information transfer system is made up of remote measurement, remote signalling input element, computer disposal link and remote control output element
The Remote closed loop control system of power production process.
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| CN104037772A (en) * | 2014-06-12 | 2014-09-10 | 国家电网公司 | Interconnected power grid automatic gain control (AGC) frequency modulation unified controller and control method |
| CN104052071A (en) * | 2014-04-18 | 2014-09-17 | 上海明华电力技术工程有限公司 | Intelligent primary frequency modulation method for generator set |
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| CA2889257C (en) * | 2012-12-07 | 2020-06-23 | Battelle Memorial Institute | Method and system for using demand side resources to provide frequency regulation using a dynamic allocation of energy resources |
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| CN103066620A (en) * | 2012-12-24 | 2013-04-24 | 中国电力科学研究院 | Design method of automatic generation control model under intermittent energy grid-connection |
| CN104052071A (en) * | 2014-04-18 | 2014-09-17 | 上海明华电力技术工程有限公司 | Intelligent primary frequency modulation method for generator set |
| CN104037772A (en) * | 2014-06-12 | 2014-09-10 | 国家电网公司 | Interconnected power grid automatic gain control (AGC) frequency modulation unified controller and control method |
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