CN108429269A - A kind of control system and method for Power System Reactive Power factor compensation - Google Patents
A kind of control system and method for Power System Reactive Power factor compensation Download PDFInfo
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- CN108429269A CN108429269A CN201810319606.XA CN201810319606A CN108429269A CN 108429269 A CN108429269 A CN 108429269A CN 201810319606 A CN201810319606 A CN 201810319606A CN 108429269 A CN108429269 A CN 108429269A
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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
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- 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
The present invention proposes a kind of control system and method for No-Work Power Compensation Capacity in Electricity System, technical problem for solving system structure complexity existing in the prior art and reactive power compensation realtime control difference, control system includes detection unit and instantaneous power factor control unit, realizes that step is：Active power calculates the fundamental component that unit obtains active power；Watt current fundamental frequency computing unit calculates the fundamental component of watt current；Load current calculates unit computational load electric current；Compensating current control instructs computing unit to calculate the compensating current control instruction current before adjusting；Instantaneous power factor computing unit calculates instantaneous power factor；The coefficient calculation unit that is self-regulated calculates self-regulation coefficient；Compensating current control instruction adjusts unit and calculates the control instruction electric current for adjusting post-compensation electric current.The present invention can be used for realizing the control compensated the dynamic of harmonic and reactive currents in circuit, improve the power factor of system.
Description
Technical field
The invention belongs to the idle technologies of electric power to compensate field, be related to a kind of reactive power compensation system and method, specifically relate to
And a kind of control system and method for Power System Reactive Power factor compensation, it can be used for realizing to harmonic wave in circuit and idle electricity
The control of the dynamic compensation of stream, improves the power factor of system.
Background technology
Due to the application of a large amount of inductive loads, there are a differential seat angles in phase for voltage, electric current in electric system, in this way
With regard to having drawn the concept of reactive power.Reactive power is the physical quantity of energy exchange between a reaction power supply and load, it big
The small amplitude for showing energy exchange between power supply and load, itself does not consume energy, meanwhile, reactive power flows in systems
Very big influence is produced on electric system itself.The presence of reactive power can increase the capacity of equipment in electric system, and increase is set
Standby and circuit loss.In recent years, with non-linear electrical equipment in electric system, the especially day of power electronic equipment application
It is beneficial extensive, added burden is brought to electric system, affects power supply quality, reduces the power factor of electric system.
Solving the problems, such as low power factor, generally there are two types of approach：One is being improved to power electronic equipment itself, make
It does not generate harmonic wave, does not also consume reactive power, and another kind is installing compensation device, such as reactive power compensator, tries pair
It is idle to compensate.First method needs to change electronic equipment, and cost is larger；And later approach is then suitable for respectively
The equipment of kind harmonic source and low power factor, therefore, it has become research hotspots.The reactive power compensator being widely used at present is main
It is divided into two classes：Static passive compensation device and dynamic reactive compensation device.Static passive compensation device primary parallel fixed capacity
Device, it is simple in structure, it is at low cost, it is easy to maintain, therefore be widely used, but it is there is also can only compensate inductive reactive power,
The shortcomings of cannot continuously adjusting, and parallel resonance may occurring, amplify harmonic current, damage capacitor with system harmonics.And
Dynamic reactive compensation device mainly has Static Var Compensator and static synchronous compensator two major classes, they are by acquiring load electricity
Stream loads the variation of reactive power according to idle monitoring algorithm and current tracking technology real-time tracking, and Mobile state of going forward side by side is idle
Power back-off has many advantages, such as fast response time, wide without parallel resonance problem, working range.Dynamic reactive compensation device at present
Just gradually replace static passive compensation device, especially static synchronous compensator, can realize phase splitting compensation, itself is not big
Energy-storage travelling wave tube, therefore represent the direction of reactive-load compensation field development.To further increase its performance, realize accurate, real-time
It monitors idle ingredient, and carries out quickly compensation in real time, power factor compensation is controlled there are a variety of methods in the prior art, than
Such as power factor compensation control system and method based on the primitive period, the power factor compensation control based on instantaneous power theory
System and method.
Such as the patent application that application publication number is CN106099943A, disclose a kind of instantaneous power factor compensation control
System and method, for solving the problems, such as that power factor compensation controls in the occasion response speed of load change slow, control system
Structure as shown in Figure 1, the Current calculation threephase load electric current i exported by three-phase system electric current and dynamic compensating deviceLa、iLb、
iLc, according to the active component I of the threephase load electric current and three-phase system voltage locking phase angle computational load electric current that are calculatedLp, nothing
Work(component ILqWith load instantaneous power factor PFL, according to given target power factor and the load current being calculated
Active component ILp, reactive component ILqWith load instantaneous power factor PFLCalculate reactive-load compensation control when target power factor control
Amount I processedqrefAnd the instantaneous value I of the idle the control of reactive power compensating amount of three-phasea_ref、Ib_ref、Ic_ref, the complete power application of the system
Reactive power dynamic compensation is realized in electronic component, computer software programming control, has and Continuous Compensation can be achieved, and loss is small etc.
Advantage.But its major defect is, since the reactive component and active component of electric current are all based on instantaneous power theory in P-Q coordinates
It is undefined, therefore three-phase current must be transformed under P-Q coordinates, which increase voltage phase locking unit, load is active and reactive
Current calculation unit causes control system complicated, and the real-time of reactive power compensation is poor.
Invention content
It is an object of the invention to overcome above-mentioned the shortcomings of the prior art, it is proposed that a kind of Power System Reactive Power
The system and method for compensating control, for solving, system structure existing in the prior art is complicated and reactive power compensation control is real
The technical problem of when property difference.
To achieve the above object, the technical solution that the present invention takes is：
A kind of control system of Power System Reactive Power factor compensation, including detection unit and the control of instantaneous power factor
Unit.
The power factor control unit, including instantaneous power factor computing unit and self-regulation coefficient calculation unit；
The instantaneous power factor computing unit, the instantaneous power factor for calculating electric system；
The self-regulation coefficient calculation unit, the self-regulation coefficient for calculating electric system by self-tuning controller.
The detection unit, including active power calculation unit, watt current fundamental frequency computing unit, load current calculate list
Member, compensating current control instruction computing unit and compensating current control instruction adjust unit.
The active power calculates unit, and three-phase voltage and three-phase current for detecting electric system utilize what is obtained
System instantaneous voltage vector sum transient current vector, calculates the instantaneous active power of electric system, and to instantaneous active power into
Row filtering, obtains electric system active power fundamental component；
The load current calculates unit, for calculating the three-phase current and dynamic benefit that unit detects according to active power
Repay the three-phase compensation current instantaneous value of device output, computational load current instantaneous value；
The watt current fundamental frequency computing unit, for calculating the obtained three-phase voltage of unit and active according to active power
Power fundamental component calculates the fundamental component instantaneous value of the watt current of electric system；
The compensating current control instructs computing unit, for calculating the load current wink that unit obtains according to load current
The fundamental component instantaneous value for the watt current that duration and watt current fundamental frequency computing unit obtain, calculates the instantaneous of deleterious current
Value, and the compensating current control instruction current before adjusting is calculated according to the instantaneous value of obtained deleterious current；
The compensating current control instruction adjusts unit, for instructing the tune that computing unit obtains according to compensating current control
The self-regulation coefficient for the electric system that compensating current control instruction current and self-regulation coefficient calculation unit before section obtain calculates
Compensating current control instruction current after adjusting.
A kind of control method of Power System Reactive Power factor compensation, includes the following steps：
(1) active power calculates unit and obtains electric system active power fundamental component pb：
(1a) active power calculates unit and obtains electric system instantaneous voltage vector v and transient current vector i：
Active power calculates unit and is detected to Three-phase Power Systems voltage and three-phase current, and by testing result three
It is indicated in dimension coordinate xyz, obtains the instantaneous voltage vector v and transient current vector i of electric system electricity consumption mains side：
V=vax+vby+vcz
I=isax+isby+iscz
Wherein, vaFor the A phase voltage instantaneous values of power system voltage, vbFor the B phase voltage instantaneous values of power system voltage,
vcFor the C phase voltage instantaneous values of power train voltage, isaFor the A phase current instantaneous values of electric system electric current, isbFor electric system electricity
The B phase current instantaneous values of stream, iscFor the C phase current instantaneous values of electric system electric current；
(1b) active power calculates unit and calculates electric system instantaneous active power p：
Active power calculates unit by electric system instantaneous voltage vector v and transient current vector i, calculates electric system
Instantaneous active power p：
P=vi=vaisa+vbisb+vcisc；
(1c) active power calculates unit and obtains electric system active power fundamental component pb：
Active power calculates unit and carries out low-pass filtering to electric system instantaneous active power p, and it is active to obtain electric system
Power fundamental component pb：
(2) active power calculates unit and calculates electric system watt current fundamental component instantaneous value ipba、ipbbAnd ipbc：
Active power calculates the base that unit is used to calculate three-phase voltage and active power that unit obtains according to active power
Frequency component calculates the watt current fundamental component instantaneous value i of electric system electricity consumption mains sidepba、ipbbAnd ipbc：
Wherein, ipbaFor the fundamental component A phase current instantaneous values of watt current；ipbbFor watt current fundamental component in B
Phase current instantaneous value；ipbcFor watt current fundamental component in C phase current instantaneous values；
(3) load current calculates unit computational load current instantaneous value iLa、iLbAnd iLc：
Load current calculates unit and utilizes electric power system power source side electric current isa、isbAnd iscWith dynamic compensating device output
Three-phase compensates the instantaneous value i of electric currentGa、iGbAnd iGc, the actual threephase load current instantaneous value i of the nearly load end of computing systemLa、iLb
And iLc：
Wherein, iLaFor load end electric current A phase current instantaneous values, iLbIt is instantaneous for the load end electric current B phase currents that detect
Value, iLcFor load end electric current C phase current instantaneous values；iGaFor reactive power compensator A phase current instantaneous values, iGbIt is filled for reactive-load compensation
Set B phase current instantaneous values, iGcFor reactive power compensator C phase current instantaneous values；
(4) compensating current control instruction computing unit calculates the compensating current control instruction current before adjusting With
(4a) compensating current control instructs the instantaneous value i of the deleterious current of computing unit calculating electric systemha、ihbAnd ihc：
Compensating current control instructs computing unit according to iLa、iLbAnd iLcAnd ipba、ipbbAnd ipbc, calculate electric system
The instantaneous value i of deleterious currentha、ihbAnd ihc：
Wherein ihaFor deleterious current A phase current instantaneous values in electric system；ihbFor deleterious current B phases electricity in electric system
Flow instantaneous value；ihcFor deleterious current C phase current instantaneous values in electric system；
(4b) compensating current control instructs computing unit according to iha、ihbAnd ihc, calculate the compensating current control before adjusting and refer to
Enable electric currentWith
Wherein,For the A phase current instantaneous values of the compensating current control instruction current before adjusting；For the compensation before adjusting
The B phase current instantaneous values of current control instruction current；C phase currents for the compensating current control instruction current before adjusting are instantaneous
Value；
(5) instantaneous power factor computing unit calculates the instantaneous power factor PF of electric systemS：
Instantaneous power factor computing unit calculates the instantaneous active power p and active power that unit obtains according to active power
Fundamental component pb, calculate instantaneous power factor PFS：
PFS=pb/p；
(6) self-regulation coefficient calculation unit calculates the self-regulation FACTOR P F_K at electric system current time：
The coefficient calculation unit that is self-regulated is according to target power factor and PFS, electric system is calculated by self-tuning controller
The self-regulation FACTOR P F_K at current time, the self-tuning controller are using discrete pi regulator, calculation formula：
PF_K=kp(PFref-PFS)+ki(PFref-PFS)+PF_K'
Wherein, kpFor the proportionality coefficient of discrete pi regulator；PFrefFor target power factor；kiFor discrete pi regulator
Integral coefficient；PF_K' is last moment calculated self-regulation coefficient.
(7) compensating current control instruction adjusts unit and calculates compensating current control instruction current i needed for electric systemca、icb
And icc：
Compensating current control instruction adjusts unit, according toWithAnd PF_K, calculate the compensation electric current control after adjusting
Instruction current i processedca、icbAnd icc。
Wherein, icaFor the A phase current instantaneous values of the compensating current control instruction current after adjusting；icbFor the benefit after adjusting
Repay the B phase current instantaneous values of current control instruction current；iccFor the C phase current winks of the compensating current control instruction current after adjusting
Duration.
Compared with prior art, the present invention having the following advantages that：
(1) present invention calculate adjust before compensating current control instruction current when, be by active power calculate unit,
What watt current fundamental frequency computing unit and compensating current control instruction computing unit were realized, it avoids the prior art and is sat
The defect of control system complexity, effectively simplifies system structure caused by mark transformation.
(2) present invention is derived using in three-dimensional coordinate based on three dimensions when calculating compensation current-order electric current
The algorithm of the watt current fundamental component of Power Theory calculates compensation current-order electric current, profit according to watt current fundamental component
Matrix operation is replaced with vector calculus, avoids in the prior art through matrix operation, calculates instantaneous active power and idle work(
Rate solves the defect of algorithm complexity caused by the command signal of compensation electric current, improves the real-time of reactive power compensation control,
Real-time reactive-load compensation effectively increases the power factor of system.
Description of the drawings
Fig. 1 is the overall structure diagram of existing power factor compensation control system；
Fig. 2 is the overall structure diagram of control system of the present invention；
Fig. 3 is the implementation flow chart of control method of the present invention.
Specific implementation mode
In the following with reference to the drawings and specific embodiments, the present invention is described in further detail.
With reference to Fig. 2, a kind of control system of No-Work Power Compensation Capacity in Electricity System includes detection unit and instantaneous power factor
Control unit.
Power factor control unit includes instantaneous power factor computing unit and self-regulation coefficient calculation unit；Instantaneous power
Factor computing unit is used to calculate the instantaneous power factor of electric system；The coefficient calculation unit that is self-regulated is used for through the control that is self-regulated
Device processed calculates the self-regulation coefficient of electric system.
Detection unit includes active power calculation unit, watt current fundamental frequency computing unit, load current calculating unit, mends
It repays current control instruction computing unit and compensating current control instruction adjusts unit.
Active power calculates the three-phase voltage and three-phase current that unit is used to detect electric system, utilizes obtained system wink
When voltage vector and transient current vector, calculate the instantaneous active power of electric system, and be filtered to instantaneous active power,
Obtain electric system active power fundamental component.
Load current calculates that unit calculates the three-phase current that detects of unit according to active power and dynamic compensating device is defeated
The three-phase compensation current instantaneous value gone out, computational load current instantaneous value.
Watt current fundamental frequency computing unit calculates the three-phase voltage and active power fundamental frequency that unit obtains according to active power
Component calculates the fundamental component instantaneous value of the watt current of electric system
Compensating current control instructs computing unit, with the load current instantaneous value obtained according to load current calculating unit, and
The fundamental component instantaneous value for the watt current that watt current fundamental frequency computing unit obtains calculates the instantaneous value of deleterious current, and root
The compensating current control instruction current before adjusting is calculated according to the instantaneous value of obtained deleterious current；
Compensating current control instruction adjusts unit, before the adjusting for instructing computing unit to obtain according to compensating current control
Compensating current control instruction current and the obtained self-regulation coefficient of electric system of self-regulation coefficient calculation unit calculate and adjust
Compensating current control instruction current afterwards.
With reference to Fig. 3, a kind of control method of No-Work Power Compensation Capacity in Electricity System includes the following steps：
Step 1：Initialize proportionality coefficient, the integral of discrete pi regulator in operational parameter, including self-regulation coefficient calculating
Coefficient；Setting needs the target power factor controlled；Set the cutoff frequency of filter, sampling time and filter caching
Device.
Step 2：Active power calculates unit and obtains electric system active power fundamental component pb：
(2a) in three-dimensional coordinate system, three reference axis are mutually orthogonal, the three-phase A phases of three-phase voltage, B phases, C phases,
Three points in x-axis y-axis z-axis are just corresponded in three-dimensional coordinate system, correspond to unique one in xyz coordinate systems
A vector, therefore each instantaneous three-phase voltage vector corresponds to a unique vector in three dimensions, and this relationship
It is one-to-one, value in reference axis is identical with corresponding mutually value.Active power calculates unit to Three-phase Power Systems
Voltage and three-phase current are detected, and testing result is indicated in three-dimensional coordinate xyz, obtain electric system electricity consumption mains side
Instantaneous voltage vector v and transient current vector i：
V=vax+vby+vcz
I=isax+isby+iscz
Wherein, vaFor the A phase voltage instantaneous values of power system voltage, vbFor the B phase voltage instantaneous values of power system voltage,
vcFor the C phase voltage instantaneous values of power train voltage, isaFor the A phase current instantaneous values of electric system electric current, isbFor electric system electricity
The B phase current instantaneous values of stream, iscFor the C phase current instantaneous values of electric system electric current.
On the basis of three-phase voltage and electric current, to derive the expression formula of active power and reactive power, in three dimensions
New three-dimensional coordinate system is established in coordinate system, vector v is resettled and reference axis as a coordinate under new coordinate system
Plane vertical reference axis Q and the reference axis F vertical with v and Q where v and vector i.Active power is obtained under new coordinate system
With the expression formula of reactive power：
P=＜ v, i ＞
(2b) active power calculates unit by electric system instantaneous voltage vector v and transient current vector i, calculates electric power
System instantaneous active power p：
P=vi=vaisa+vbisb+vcisc；
(2c) active power calculates unit and carries out low-pass filtering to electric system instantaneous active power p, obtains electric system
Active power fundamental component pb：
Step 3：Active power calculates unit and is used to calculate the three-phase voltage and wattful power that unit obtains according to active power
The fundamental component of rate calculates the watt current fundamental component instantaneous value i of electric system electricity consumption mains sidepba、ipbbAnd ipbc：
Wherein, ipbaFor the fundamental component A phase current instantaneous values of watt current；ipbbFor watt current fundamental component in B
Phase current instantaneous value；ipbcFor watt current fundamental component in C phase current instantaneous values；
Step 4：Load current calculates unit and utilizes electric power system power source side electric current isa、isbAnd iscAnd dynamic compensating device
The instantaneous value i of the three-phase compensation electric current of outputGa、iGbAnd iGc, the actual threephase load current instantaneous value of the nearly load end of computing system
iLa、iLbAnd iLc：
Wherein, iLaFor load end electric current A phase current instantaneous values, iLbIt is instantaneous for the load end electric current B phase currents that detect
Value, iLcFor load end electric current C phase current instantaneous values；iGaFor reactive power compensator A phase current instantaneous values, iGbIt is filled for reactive-load compensation
Set B phase current instantaneous values, iGcFor reactive power compensator C phase current instantaneous values；
Step 5：Compensating current control instructs computing unit to calculate the compensating current control instruction current before adjusting
With
(5a) compensating current control instructs computing unit according to iLa、iLbAnd iLcAnd ipba、ipbbAnd ipbc, calculate electric power
The instantaneous value i of systemic adverse electric currentha、ihbAnd ihc：
Wherein ihaFor deleterious current A phase current instantaneous values in electric system；ihbFor deleterious current B phases electricity in electric system
Flow instantaneous value；ihcFor deleterious current C phase current instantaneous values in electric system；
(5b) compensating current control instructs computing unit according to iha、ihbAnd ihc, calculate the compensating current control before adjusting and refer to
Enable electric currentWith
Wherein,For the A phase current instantaneous values of the compensating current control instruction current before adjusting；For the compensation before adjusting
The B phase current instantaneous values of current control instruction current；C phase currents for the compensating current control instruction current before adjusting are instantaneous
Value；
Step 6：Instantaneous power factor computing unit calculates the instantaneous active power p and have that unit obtains according to active power
The fundamental component p of work(powerb, calculate instantaneous power factor PFS：
PFS=pb/p；
Step 7：The coefficient calculation unit that is self-regulated is according to target power factor and PFS, electricity is calculated by self-tuning controller
The self-regulation FACTOR P F_K at Force system current time；Discrete pi regulator, meter are used using self-tuning controller in the present embodiment
Calculating formula is：
PF_K=kp(PFref-PFS)+ki(PFref-PFS)+PF_K'
Wherein, kpFor the proportionality coefficient of discrete pi regulator；PFrefFor target power factor；kiFor discrete pi regulator
Integral coefficient；PF_K' is last moment calculated self-regulation coefficient.The output PF_K of self-tuning controller should make at amplitude limit
Reason, this method embodiment can have 20% self-adjusting ability, therefore clipping range can be set as -0.2~+0.2.
Step 8：Compensating current control instruction adjusts unit, according toWithAnd PF_K, calculate the compensation after adjusting
Current control instruction current ica、icbAnd icc。
Its calculation formula is：
Wherein, icaFor the A phase current instantaneous values of the compensating current control instruction current after adjusting；icbFor the benefit after adjusting
Repay the B phase current instantaneous values of current control instruction current；iccFor the C phase current winks of the compensating current control instruction current after adjusting
Duration.
Step 9：Above step is completed, after waiting for next moment to arrive, return to step 2, into cipher rounds next time,
The related content of cycle calculations step 2~step 8, can get each operation moment, and transient compensation current control command signal reaches
To the purpose for carrying out real-time control to instantaneous power factor compensation.
Claims (4)
1. a kind of control system of Power System Reactive Power factor compensation, including detection unit and instantaneous power factor control list
Member, wherein：
The instantaneous power factor control unit, including instantaneous power factor computing unit and self-regulation coefficient calculation unit；Institute
Instantaneous power factor computing unit is stated, the instantaneous power factor for calculating electric system；The self-regulation coefficient calculation unit,
Self-regulation coefficient for calculating electric system by self-tuning controller；
It is characterized in that：
The detection unit, including active power calculation unit, watt current fundamental frequency computing unit, load current calculating unit,
Compensating current control instructs computing unit and compensating current control instruction to adjust unit, wherein：
The active power calculates unit, and three-phase voltage and three-phase current for detecting electric system utilize obtained system
Instantaneous voltage vector sum transient current vector, calculates the instantaneous active power of electric system, and filter to instantaneous active power
Wave obtains electric system active power fundamental component；
The load current calculates unit, is filled with dynamic compensation for calculating the three-phase current that unit detects according to active power
Set the three-phase compensation current instantaneous value of output, computational load current instantaneous value；
The watt current fundamental frequency computing unit, for calculating the three-phase voltage and active power that unit obtains according to active power
Fundamental component calculates the fundamental component instantaneous value of the watt current of electric system；
The compensating current control instructs computing unit, instantaneous for calculating the load current that unit obtains according to load current
The fundamental component instantaneous value for the watt current that value and watt current fundamental frequency computing unit obtain, calculates the instantaneous value of deleterious current,
And the compensating current control instruction current before adjusting is calculated according to the instantaneous value of obtained deleterious current；
The compensating current control instruction adjusts unit, before the adjusting for instructing computing unit to obtain according to compensating current control
Compensating current control instruction current and the obtained self-regulation coefficient of electric system of self-regulation coefficient calculation unit calculate and adjust
Compensating current control instruction current afterwards.
2. a kind of control method of Power System Reactive Power factor compensation, which is characterized in that include the following steps：
(1) active power calculates unit and obtains electric system active power fundamental component pb：
(1a) active power calculates unit and obtains electric system instantaneous voltage vector v and transient current vector i：
Active power calculates unit and is detected to Three-phase Power Systems voltage and three-phase current, and testing result is sat in three-dimensional
It is indicated in mark xyz, obtains the instantaneous voltage vector v and transient current vector i of electric system electricity consumption mains side：
V=vax+vby+vcz
I=isax+isby+iscz
Wherein, vaFor the A phase voltage instantaneous values of power system voltage, vbFor the B phase voltage instantaneous values of power system voltage, vcFor
The C phase voltage instantaneous values of power train voltage；isaFor the A phase current instantaneous values of electric system electric current, isbFor electric system electric current
B phase current instantaneous values, iscFor the C phase current instantaneous values of electric system electric current；
(1b) active power calculates unit and calculates electric system instantaneous active power p：
Active power calculates unit by electric system instantaneous voltage vector v and transient current vector i, and it is instantaneous to calculate electric system
Active power p：
P=vi=vaisa+vbisb+vcisc；
(1c) active power calculates unit and obtains electric system active power fundamental component pb：
Active power calculates unit and carries out low-pass filtering to electric system instantaneous active power p, obtains electric system active power
Fundamental component pb：
(2) active power calculates unit and calculates electric system watt current fundamental component instantaneous value ipba、ipbbAnd ipbc：
Active power calculates the fundamental frequency point that unit is used to calculate three-phase voltage and active power that unit obtains according to active power
Amount calculates the watt current fundamental component instantaneous value i of electric system electricity consumption mains sidepba、ipbbAnd ipbc：
Wherein, ipbaFor the fundamental component A phase current instantaneous values of watt current；ipbbIt is electric in B phases for the fundamental component of watt current
Flow instantaneous value；ipbcFor watt current fundamental component in C phase current instantaneous values；
(3) load current calculates unit computational load current instantaneous value iLa、iLbAnd iLc：
Load current calculates unit and utilizes electric power system power source side electric current isa、isbAnd iscWith the three-phase of dynamic compensating device output
Compensate the instantaneous value i of electric currentGa、iGbAnd iGc, the actual threephase load current instantaneous value i of the nearly load end of computing systemLa、iLbWith
iLc：
Wherein, iLaFor load end electric current A phase current instantaneous values, iLbFor the load end electric current B phase current instantaneous values detected, iLc
For load end electric current C phase current instantaneous values；iGaFor reactive power compensator A phase current instantaneous values, iGbFor reactive power compensator B phases
Current instantaneous value, iGcFor reactive power compensator C phase current instantaneous values；
(4) compensating current control instruction computing unit calculates the compensating current control instruction current before adjusting With
(4a) compensating current control instructs the instantaneous value i of the deleterious current of computing unit calculating electric systemha、ihbAnd ihc：
Compensating current control instructs computing unit according to iLa、iLbAnd iLcAnd ipba、ipbbAnd ipbc, it is harmful to calculate electric system
The instantaneous value i of electric currentha、ihbAnd ihc：
Wherein ihaFor deleterious current A phase current instantaneous values in electric system；ihbIt is instantaneous for deleterious current B phase currents in electric system
Value；ihcFor deleterious current C phase current instantaneous values in electric system；
(4b) compensating current control instructs computing unit according to iha、ihbAnd ihc, calculate the compensating current control instruction electricity before adjusting
StreamWith
Wherein,For the A phase current instantaneous values of the compensating current control instruction current before adjusting；For the compensation electric current before adjusting
The B phase current instantaneous values of control instruction electric current；For the C phase current instantaneous values of the compensating current control instruction current before adjusting；
(5) instantaneous power factor computing unit calculates the instantaneous power factor PF of electric systemS：
Instantaneous power factor computing unit calculates the base of instantaneous active power p and active power that unit obtains according to active power
Frequency component pb, calculate instantaneous power factor PFS：
PFS=pb/p；
(6) self-regulation coefficient calculation unit calculates the self-regulation FACTOR P F_K of electric system：
The coefficient calculation unit that is self-regulated is according to target power factor and PFS, when current by self-tuning controller calculating electric system
The self-regulation FACTOR P F_K at quarter；
(7) compensating current control instruction adjusts unit and calculates compensating current control instruction current i needed for electric systemca、icbWith
icc：
Compensating current control instruction adjusts unit, according toWithAnd PF_K, it calculates the compensating current control after adjusting and refers to
Enable electric current ica、icbAnd icc。
3. a kind of control method of Power System Reactive Power factor compensation according to claim 2, which is characterized in that step
Suddenly the self-tuning controller described in (6) calculates the self-regulation FACTOR P F_K at electric system current time, wherein self-regulation control
Device uses discrete pi regulator, and calculation formula is：
PF_K=kp(PFref-PFS)+ki(PFref-PFS)+PF_K'
Wherein, kpFor the proportionality coefficient of discrete pi regulator；PFrefFor target power factor；kiFor the integral of discrete pi regulator
Coefficient；PF_K' is the self-regulation coefficient of electric system last moment.
4. a kind of control method of Power System Reactive Power factor compensation according to claim 2, which is characterized in that step
Suddenly the compensating current control instruction described in (7) adjusts unit and calculates compensating current control instruction current i needed for electric systemca、icb
And icc, calculation formula is respectively：
Wherein, icaFor the A phase current instantaneous values of the compensating current control instruction current after adjusting；icbFor the compensation electric current after adjusting
The B phase current instantaneous values of control instruction electric current；iccFor the C phase current instantaneous values of the compensating current control instruction current after adjusting.
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