CN108880365A - A kind of synchronous generator excited system difference coefficient setting method - Google Patents
A kind of synchronous generator excited system difference coefficient setting method Download PDFInfo
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- CN108880365A CN108880365A CN201810634208.7A CN201810634208A CN108880365A CN 108880365 A CN108880365 A CN 108880365A CN 201810634208 A CN201810634208 A CN 201810634208A CN 108880365 A CN108880365 A CN 108880365A
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- generator
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- difference coefficient
- constraint
- excited system
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2103/00—Controlling arrangements characterised by the type of generator
- H02P2103/20—Controlling arrangements characterised by the type of generator of the synchronous type
Abstract
The invention proposes a kind of synchronous generator excited system difference coefficient setting methods.Firstly, the working voltage of the number, each backbone point of clear area backbone point in day part, the active power output of generator number of nodes, each generator, by the load value of each generator powered；Then, backbone point voltage standard poor index are calculated, voltage fluctuation situation is measured, and calculate average active power loss rate index, consider system performance driving economy；Finally, establishing synchronous generator excited system difference coefficient Model for Multi-Objective Optimization, with backbone point voltage standard difference and the average minimum target of active power loss rate, considers the constraint conditions such as trend constraint, control variables constraint and security constraint, calculate optimal difference coefficient.This method can be effectively improved network voltage and reduce network loss.
Description
Technical field
The present invention relates to synchronous generator fields, and in particular to a kind of synchronous generator excited system difference coefficient adjusting side
Method, the adjusting suitable for synchronous generator excited system difference coefficient in the same industry.
Background technique
The control of power system reactive power voltage and management are to improve power quality, reduce network loss and guarantee power grid security economy
The important content of operation, while being also the object that researcher and operations staff pay close attention to.Voltage is the weight for measuring power quality
Want one of index, voltage level of power grid depends on the balance of Power System Reactive Power, when reactive power source in system and idle negative
When the equilibrium relation of lotus is broken, it will cause voltage ripple of power network, via net loss increases.Therefore the reactive power/voltage control of power grid
Not only the quality of voltage of power grid had been affected, but also has been related to the economical operation of power grid.
Reasonable planning and control reactive power source are the important measures for guaranteeing power system security economical operation.Synchronous generator
Machine is unique active power supply in electric system, while being also main reactive power source, has Reactive-power control range big, quick
Automatic continuous Reactive-power control, Reactive-power control quality are good, are not necessarily to the features such as additional investment, have to the voltage level of power grid important
It influences.
The size of synchronous generator excited system difference coefficient is the weight for describing synchronous generator reactive voltage control characteristic
Parameter is wanted, value size not only has great influence to the idle and voltage of generator, but also influences the voltage of power grid indirectly
Horizontal and power grid network loss.It is therefore desirable to adjusting is optimized to it.
At present administrative department of power grid enterprises according to generator excited system technical requirements national standard, to generator excitation
The adjusting of system difference coefficient, to guarantee that engine health runs the idle reasonable distribution between Multi-generator system in power plant
For target, supporting role of the generator excited system difference coefficient to network voltage and reduction network loss is improved is considered.
Exciter control system is the automatic control collectively constituted by synchronous generator, exciting power unit and field regulator
System, block diagram are as shown in Figure 1.As shown in Figure 1, field regulator AVR detects voltage UG, electric current IG or other shapes of generator
State amount is adjusted and is controlled to exciting current IEF according to specified adjustment criteria by exciting power unit, is realized to power generation
Idle-voltage control of machine, and its difference coefficient value determines generator reactive-voltage regulation properties.
The excitation system difference coefficient of generator refers to generator voltage, changes with generator reactive power variation
Straight slope, it is as follows：
It can be divided into according to the definition of difference coefficient and just adjust poor, negative tune difference and acyclic homologically trioial poor, as shown in Figure 2.
Summary of the invention
The purpose of the present invention is：In order to realize the reactive balance of electric system, guarantees power system security economical operation, change
Kind network voltage and reduction network loss, the present invention proposes a kind of synchronous generator excited system difference coefficient setting method, according to grain
Swarm optimization solves optimal difference coefficient.
The technical scheme is that：A kind of synchronous generator excited system difference coefficient setting method, including following step
Suddenly：
Step 1：Obtain number m, the generator number n of regional voltage backbone point to be calculated, run the period number T, voltage maincenter
The working voltage of point at various momentsActive power output of the generator node in each time of runningIt is corresponding with generator
The burden with power of load bus at various momentsWhereinVoltage for i-th of backbone point t-th of moment,For jth
Active power output of a generator t-th of moment,It is born for load corresponding with j-th of generator in t-th of the active of moment
Lotus；
Step 2：Calculate backbone point voltage standard poor index；Substation busbars is the backbone point of regional reactive power/voltage control,
Its working voltage quality is the important guarantee of area power grid safe operation.In order to analyze substation bus bar quality of voltage in power grid,
Introduce multi-period lower backbone point voltage standard poor index.
Step 3：Calculate average active power loss rate index；While guaranteeing backbone point voltage fluctuation minimum, system is considered
The economy of operation proposes average active power loss rate index.
Step 4：Synchronous generator exciting is established with backbone point voltage standard difference and the average minimum target of active power loss rate
System difference coefficient Optimized model, the difference coefficient of each generator excited system is adjusted according to Optimized model.
Further, the backbone point voltage standard poor index in the step 2 are that multi-period lower backbone point voltage standard is poor
Index, formula are as follows：
In formula：I=1,2, m, m are the number of voltage backbone point；T=1,2, T, T are run the period
Number；
For i-th of backbone point t-th of period working voltage；It is run within T period for i-th of backbone point
The average value of voltage.
Further, the average active power loss rate index calculation formula in the step 3 is：
In formula：J=1,2, n, n are the number of generator node；T=1,2, T, T are run the period
Number；
For j-th of generator t-th of moment active power output；It is load corresponding with j-th of generator in t
The burden with power at a moment.
Further, the step 4 is with backbone point voltage standard difference and the average minimum target of active power loss rate；
Establish the multi-period electric power system tide model of meter and generator excited system difference coefficient, creation meter and generator
The P β node of excitation system difference coefficient；Using trend constraint, control variables constraint and security constraint as constraint condition.
Further, the formula of synchronous generator excited system difference coefficient Optimized model is as follows in the step 4：
(1) objective function
The economy for comprehensively considering area power grid voltage fluctuation and network loss establishes synchronous generator excited system tune difference system
The optimization aim of several multi-period multiple targets is as follows：
Min F=(F1,F2)
In formula, F1And F2Respectively indicate backbone point voltage standard deviation and average active power loss rate；
(2) constraint condition
In order to analyze influence of the difference coefficient to system load flow, the more of meter and generator excited system difference coefficient are established
Period electric power system tide model, the P β node of creation meter and generator excited system difference coefficient, i.e. known generators are active
Power P and generator excitation system difference coefficient β generator reactive power and voltage magnitude relationship are as follows
In formula：UHirefFor generator high side bus voltage target reference；UHiFor generator high side voltage；QGiref
For generator reactive power reference value；QGFor generator reactive power；
Constraint when each under discontinuity surface is as follows：
A：Trend constraint
B：Control variables constraint
Controlling variable is generator excited system difference coefficient β in area, and generator excited system difference coefficient range is about
Shu Wei：
βmin≤β≤βmax
In formula：β is generator excited system difference coefficient, βminAnd βmaxRespectively difference coefficient adjusts lower and upper limit；
C：Security constraint
Each node voltage security constraint is in area：
Umin≤U≤Umax
In formula：U is node voltage, UminAnd UmaxRespectively node voltage runs lower and upper limit
Each generator node reactive power constraint in area：
QGmin≤QG≤QGmax
In formula：QGFor the idle power output of generator；QGminAnd QGmaxRespectively generator reactive power output lower and upper limit.
The beneficial effects of the invention are as follows：Setting method of the invention is with backbone point voltage standard difference and average active power loss rate
Minimum target establishes synchronous generator excited system difference coefficient Optimized model, can be in the reactive balance for realizing electric system
While, it is effectively improved network voltage, power quality is improved, reduce network loss and guarantees power grid security economical operation.
Detailed description of the invention
Fig. 1 is exciter control system automatic control system block diagram；
Fig. 2 is the excitation system difference coefficient schematic diagram of generator；
Fig. 3 is flow chart of the invention.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
A kind of synchronous generator excited system difference coefficient setting method, the number of backbone point clear regional first, it is each in
Voltage of the centring point in day part, the active power output of generator number of nodes, each generator, the corresponding load value of each generator；Then
Calculate separately backbone point voltage standard poor index and average active power loss rate index；Finally, with backbone point voltage standard difference peace
The equal minimum target of active power loss rate establishes synchronous generator excited system difference coefficient Optimized model, is adjusted according to Optimized model
The difference coefficient of each generator excited system.It is illustrated in figure 3 flow chart of the invention.
Specifically include following steps：
Step 1：Obtain number m, the generator number n of regional voltage backbone point to be calculated, run the period number T, voltage maincenter
The working voltage of point at various momentsActive power output of the generator node in each time of runningIt is corresponding with generator
The burden with power of load bus at various momentsWhereinVoltage for i-th of backbone point t-th of moment,For jth
Active power output of a generator t-th of moment,It is born for load corresponding with j-th of generator in t-th of the active of moment
Lotus；
Step 2：Calculate backbone point voltage standard poor index.Substation busbars is the backbone point of regional reactive power/voltage control,
Its working voltage quality is the important guarantee of area power grid safe operation.In order to analyze substation bus bar quality of voltage in power grid,
It is as follows to introduce multi-period lower backbone point voltage standard poor index：
In formula：I=1,2, m, m are the number of voltage backbone point；T=1,2, T, T are run the period
Number；For i-th of backbone point t-th of period working voltage；It is i-th of backbone point in the flat of T period working voltage
Mean value.
Step 3：Calculate average active power loss rate index.While guaranteeing backbone point voltage fluctuation minimum, system is considered
The economy of operation proposes average active power loss rate index：
In formula：J=1,2, n, n are the number of generator node；T=1,2, T, T are run the period
Number；For j-th of generator t-th of moment active power output；It is load corresponding with j-th of generator at t-th
The burden with power at quarter.
Step 4：Synchronous generator exciting is established with backbone point voltage standard difference and the average minimum target of active power loss rate
System difference coefficient Optimized model, the difference coefficient of each generator excited system is adjusted according to Optimized model.
The formula of synchronous generator excited system difference coefficient Optimized model is as follows：
(1) objective function
The economy for comprehensively considering area power grid voltage fluctuation and network loss establishes synchronous generator excited system tune difference system
The optimization aim of several multi-period multiple targets is as follows：
Min F=(F1,F2)
In formula, F1And F2Respectively indicate backbone point voltage standard deviation and average active power loss rate；
(2) constraint condition
In order to analyze influence of the difference coefficient to system load flow, the more of meter and generator excited system difference coefficient are established
Period electric power system tide model, the P β node of creation meter and generator excited system difference coefficient, i.e. known generators are active
Power P and generator excitation system difference coefficient β generator reactive power and voltage magnitude relationship are as follows
In formula：UHirefFor generator high side bus voltage target reference；UHiFor generator high side voltage；QGiref
For generator reactive power reference value；QGFor generator reactive power；
Constraint when each under discontinuity surface is as follows：
A：Trend constraint
B：Control variables constraint
Controlling variable is generator excited system difference coefficient β in area, and generator excited system difference coefficient range is about
Shu Wei：
βmin≤β≤βmax
In formula：β is generator excited system difference coefficient, βminAnd βmaxRespectively difference coefficient adjusts lower and upper limit；
C：Security constraint
Each node voltage security constraint is in area：
Umin≤U≤Umax
In formula：U is node voltage, UminAnd UmaxRespectively node voltage runs lower and upper limit
Each generator node reactive power constraint in area：
QGmin≤QG≤QGmax
In formula：QGFor the idle power output of generator；QGminAnd QGmaxRespectively generator reactive power output lower and upper limit.
Claims (5)
1. a kind of synchronous generator excited system difference coefficient setting method, which is characterized in that include the following steps：
Step 1：Number m, the generator number n of regional voltage backbone point to be calculated, run the period number T are obtained, voltage backbone point exists
The working voltage at each momentActive power output of the generator node in each time of runningLoad corresponding with generator
The burden with power of node at various momentsWhereinVoltage for i-th of backbone point t-th of moment,It is sent out for j-th
Active power output of the motor t-th of moment,For load corresponding with j-th of generator t-th of moment burden with power；
Step 2：Calculate backbone point voltage standard poor index；
Step 3：Calculate average active power loss rate index；
Step 4：Synchronous generator excited system is established with backbone point voltage standard difference and the average minimum target of active power loss rate
Difference coefficient Optimized model adjusts the difference coefficient of each generator excited system according to Optimized model.
2. a kind of synchronous generator excited system difference coefficient setting method according to claim 1, which is characterized in that institute
The backbone point voltage standard poor index stated in step 2 are multi-period lower backbone point voltage standard poor index, and formula is as follows：
In formula：I=1,2, m, m are the number of voltage backbone point；T=1,2, T, T are run the period number；
For i-th of backbone point t-th of period working voltage；For i-th of backbone point, working voltage is averaged within the T period
Value.
3. a kind of synchronous generator excited system difference coefficient setting method according to claim 1, which is characterized in that institute
The average active power loss rate index calculation formula stated in step 3 is：
In formula：J=1,2, n, n are the number of generator node；T=1,2, T, T are run the period number；
For j-th of generator t-th of moment active power output；For load corresponding with j-th of generator having t-th moment
Workload.
4. a kind of synchronous generator excited system difference coefficient setting method according to claim 1, which is characterized in that institute
Step 4 is stated with backbone point voltage standard difference and the average minimum target of active power loss rate；Establish meter and generator excited system tune
The multi-period electric power system tide model of poor coefficient, the P β node of creation meter and generator excited system difference coefficient；With trend
Constraint, control variables constraint and security constraint are constraint condition.
5. a kind of synchronous generator excited system difference coefficient setting method according to claim 4, which is characterized in that institute
The formula for stating synchronous generator excited system difference coefficient Optimized model in step 4 is as follows：
(1) objective function
The economy for comprehensively considering area power grid voltage fluctuation and network loss establishes synchronous generator excited system difference coefficient
The optimization aim of multi-period multiple target is as follows：
Min F=(F1,F2)
In formula, F1And F2Respectively indicate backbone point voltage standard deviation and average active power loss rate；
(2) constraint condition
Generator reactive power and voltage magnitude relationship are as follows：
In formula：UHirefFor generator high side bus voltage target reference；UHiFor generator high side voltage；QGirefFor hair
Motor reactive power reference qref；QGFor generator reactive power；
Constraint when each under discontinuity surface is as follows：
A：Trend constraint
B：Control variables constraint
Controlling variable is generator excited system difference coefficient β in area, and generator excited system difference coefficient range constraint is：
βmin≤β≤βmax
In formula：β is generator excited system difference coefficient, βminAnd βmaxRespectively difference coefficient adjusts lower and upper limit；
C：Security constraint
Each node voltage security constraint is in area：
Umin≤U≤Umax
In formula：U is node voltage, UminAnd UmaxRespectively node voltage runs lower and upper limit
Each generator node reactive power constraint in area：
QGmin≤QG≤QGmax
In formula：QGFor the idle power output of generator；QGminAnd QGmaxRespectively generator reactive power output lower and upper limit.
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Cited By (3)
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| CN110323979A (en) * | 2019-07-30 | 2019-10-11 | 广西电网有限责任公司电力科学研究院 | A kind of generator excitation difference coefficient optimization setting method considering voltage stabilization |
| CN110380404A (en) * | 2019-04-24 | 2019-10-25 | 国网辽宁省电力有限公司电力科学研究院 | Consider that the power transmission network excitation system difference coefficient of highly energy-consuming point load optimizes setting method |
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| CN110109011A (en) * | 2019-03-20 | 2019-08-09 | 广西电网有限责任公司电力科学研究院 | A kind of method of determining generating unit excitation difference coefficient optimum range |
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Application publication date: 20181123 |