CN101741093A - Reactive power compensation and harmonic governance system and control method for realizing power compensation and harmonic governance by using the same - Google Patents
Reactive power compensation and harmonic governance system and control method for realizing power compensation and harmonic governance by using the same Download PDFInfo
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
A reactive power compensation and harmonic governance system and a control method for realizing power compensation and harmonic governance by using the same belong to the field of an electric system and solve the problems that the prior reactive power compensation technique cannot synchronously realize the full compensation for the electric network while meeting the reactive power compensation of continuous change, compensating capacity has waste and system cost is high. The system of the invention uses the structure that M groups of TSCs are connected to the electric network in parallel, the three-phase output ends of SVG are respectively connected to one end of an inductor, the other end of each of three inductors is respectively connected the three phases of the electric network. The control method of the reactive power compensation and the harmonic governance comprises: processing the collected electric current values and voltage values by a controller, obtaining the control parameters of the TSC according to a switching rule for realizing stage reactive power compensation, obtaining the control parameters of the SVG by combining with an instantaneous reactive power theory for realizing the compensation of the residual reactive power between each two stages. The invention realizes the quick and continuous reactive power compensation and the harmonic governance under the condition that load contains harmonic current, and is used for the reactive power compensation of the electric system.
Description
Technical field
The present invention relates to a kind of reactive power compensation and harmonic wave governing system and use the control method that this system realizes reactive power compensation and harmonic wave control, belong to field of power.
Background technology
There are the frequent and violent equipment of many idle variations such as rolling mill, injection molding machine, asynchronous machine (soft start) and portal crane etc. in the existing distribution system, tend to cause the problem of electric voltage dropping and low power factor, this not only makes the power distribution network line loss increase, also the high precision equipment of some supply power voltage quality requirements is produced harm greatly simultaneously, therefore, higher to the requirement of reactive power compensator.Existing distribution network var compensation device mainly contains fixed capacitor, thyristor switchable capacitor, the fixed capacitor of passive type and the static reacance generator of thyristor-controlled reactor combination and active formula etc. of passive type.
Said apparatus has the following disadvantages:
1, the fixed capacitor of passive type can't compensate the idle of variation;
2, thyristor switchable capacitor can carry out grading compensation to idle, but during idle continuous variation, can not accomplish full remuneration; And when containing harmonic wave in the system,, need in the thyristor switchable capacitor capacitive branch, seal in the wave arrestment reactor in order to prevent thyristor switchable capacitor and system's generation resonance, and increased the cost of device, reduced reactive compensation capacity;
3, the combination of the fixed capacitor of passive type and thyristor-controlled reactor can be to idle realization Continuous Compensation, but thyristor-controlled reactor can produce harmonic wave, simultaneously because thyristor-controlled reactor produces and lags behind idlely, so the capacity of the fixed capacitor of passive type and thyristor-controlled reactor capacity sum are greater than the reactive capability of the required compensation of system;
4, static reacance generator can be to the idle quick and continuous compensation of carrying out, the harmonic wave that produces when operation is little, need not be provided with filter, there is not possibility with system resonance, steady-state behaviour and dynamic property all are better than the reactive power compensator of passive type, but cost is higher at present, and most users are difficult to bear, and has therefore limited the through engineering approaches and the practicalization of static reacance generator.
Summary of the invention
The objective of the invention is to change the full remuneration that realizes in idle network system continuously satisfying compensation for solving existing reactive power compensation technology, compensation capacity exists waste and the high problem of system cost, a kind of reactive power compensation and harmonic wave governing system is provided and uses the control method that this system realizes reactive power compensation and harmonic wave control.
The present invention is achieved by following proposal: a kind of reactive power compensation and harmonic wave governing system, it partly is made up of Passive Reactive Power Compensation part, control section and active reactive power compensation and harmonic wave control, Passive Reactive Power Compensation part and active reactive power compensation and harmonic wave control part access electrical network in parallel
Described Passive Reactive Power Compensation part is composed in parallel by M group thyristor switchable capacitor, thyristor valve group and compensation condenser C that the thyristor of two reverse parallel connections constitutes are connected into a branch road, three groups of described branch roads adopt the triangle connected mode to connect and compose one group of thyristor switchable capacitor, tie point is linked into respectively in the three-phase of electrical network, wherein, M is the integer greater than 1
Described active reactive power compensation and harmonic wave control part are made up of a static reacance generator and three inductance, static reacance generator is made up of the voltage-source type three-phase full-bridge inverter, the three-phase output end of voltage-source type three-phase full-bridge inverter connects an end of an inductance respectively, the other end of three inductance is connected respectively in the three-phase of electrical network
Described control section is by controller, the TSC drive circuit, the SVG drive circuit, first optical coupling isolation circuit and second optical coupling isolation circuit are formed, controller connects the TSC drive circuit to realize the control to the TSC drive circuit by first optical coupling isolation circuit, the M of a TSC drive circuit control signal output ends links to each other with the gate pole trigger end of M group thyristor switchable capacitor respectively, controller connects the SVG drive circuit to realize the control to the SVG drive circuit by second optical coupling isolation circuit, and 6 control signal output ends of SVG drive circuit link to each other with 6 gate pole trigger ends of static reacance generator respectively.
Use a kind of reactive power compensation and harmonic wave governing system and realize the control method of reactive power compensation and harmonic wave control, the process of reactive power compensation and harmonic wave control is:
The instantaneous value of step 1, detection of grid a phase current
i SaAnd the instantaneous value of electrical network c phase current
i Sc, the instantaneous value of detection load a phase current
i LaAnd the instantaneous value of load c phase current
i Lc, the instantaneous value of a phase current of detection static reacance generator output
i FaAnd the instantaneous value of the c phase current of static reacance generator output
i Fc, the instantaneous value of detection static reacance generator DC bus-bar voltage
u Dc
The instantaneous value of the load a phase current that step 2, controller obtain according to sampling
i LaAnd the instantaneous value of load c phase current
i Lc, utilize thyristor switchable capacitor switching rule to calculate the switching compound mode of thyristor switchable capacitor
W, the TSC drive circuit sends TSC switching signal
S 1~
S M To finish above-mentioned switching mode combination;
The instantaneous value of the electrical network a phase current that step 3, controller obtain according to sampling
i SaAnd the instantaneous value of electrical network c phase current
i Sc, utilize instantaneous reactive power theory to calculate the command value of static reacance generator offset current
i * Fa
The instantaneous value of a phase current that the static reacance generator that step 4, controller obtain according to sampling is exported
i Fa, static reacance generator output the instantaneous value of c phase current
i Fc, the static reacance generator DC bus-bar voltage instantaneous value
u DcAnd the static reacance generator offset current command value that in step 3, obtains
i * Fa, adopt the Direct Current Control method to generate pwm signal, the SVG drive circuit sends SVG switching signal
P 1~
P 6
The present invention adopts the mode of Passive Reactive Power Compensation and active reactive power compensation combined reactive compensation that network system is carried out reactive power compensation, when idle the changing in the load, in described a kind of reactive power compensation and the harmonic wave governing system, thyristor switchable capacitor is to the required idle grading compensation that carries out, static reacance generator to thyristor switchable capacitor at different levels between idle the compensating of residue.Controller of the present invention adopts full digital control method, makes described a kind of reactive power compensation and harmonic wave governing system still have good dynamic characteristics and stable state accuracy under the violent situation of the fluctuation of load.When containing harmonic current in the load, static reacance generator is realized the harmonic current that contains in the load is filtered, and suppresses thyristor switchable capacitor and system's generation resonance, therefore, the wave arrestment reactor of need not connecting again in every branch road of thyristor switchable capacitor is saved system cost.The present invention is in conjunction with rapidity and continuity and thyristor switchable capacitor the cost advantage when compensation big capacity idle of static reacance generator to reactive power compensation, provide a kind of to loading on the high performance-price ratio scheme that contains the idle quick and continuous compensation of big capacity under the harmonic current environment, have favorable social and economic benefits, be suitable in electric power system, promoting the use of.
Description of drawings
Fig. 1 is the structural representation of a kind of reactive power compensation and harmonic wave governing system; Fig. 2 is a flow chart of using the control method of a kind of reactive power compensation and realization reactive power compensation of harmonic wave governing system and harmonic wave control; Fig. 3 is the capacity schematic diagram that the mode of employing TSC and SVG combined reactive compensation compensates load, wherein, the line segment of band " △ " is the required idle capacity signal of network system, the line segment of band " * " is that thyristor switchable capacitor TSC is to the required idle capacity signal of carrying out grading compensation, the line segment of band " " be static reacance generator SVG to thyristor switchable capacitor TSC at different levels between the idle capacity signal that compensates of residue, the line segment of band " zero " is that the reactive compensation capacity that adopts TSC and SVG to carry out combined reactive compensation is illustrated; Fig. 4 is the flow chart of the switching rule of thyristor switchable capacitor TSC.
Embodiment
Embodiment one: specify present embodiment below in conjunction with Fig. 1, Fig. 2 and Fig. 3.A kind of reactive power compensation and harmonic wave governing system be by Passive Reactive Power Compensation part 1, control section 2 and active reactive power compensation and harmonic wave control part 3, Passive Reactive Power Compensation part 1 and active reactive power compensation and harmonic wave control part 3 access electrical networks in parallel,
Described Passive Reactive Power Compensation part 1 is composed in parallel by M group thyristor switchable capacitor TSC, thyristor valve group and compensation condenser C that the thyristor D of two reverse parallel connections constitutes are connected into a branch road, three groups of described branch roads adopt the triangle connected mode to connect and compose one group of thyristor switchable capacitor TSC, tie point is linked into respectively in the three-phase of electrical network, wherein, M is the integer greater than 1
Described active reactive power compensation and harmonic wave control part 3 are made up of a static reacance generator SVG and three inductance L, static reacance generator SVG is made up of the voltage-source type three-phase full-bridge inverter, the three-phase output end of voltage-source type three-phase full-bridge inverter connects an end of an inductance L respectively, the other end of three inductance L is connected respectively in the three-phase of electrical network
Described control section 2 is by controller 2-1, TSC drive circuit 2-2, SVG drive circuit 2-3, the first optical coupling isolation circuit 2-4 and the second optical coupling isolation circuit 2-5 form, controller 2-1 connects TSC drive circuit 2-2 to realize the control to TSC drive circuit 2-2 by the first optical coupling isolation circuit 2-4, M the control signal output ends of TSC drive circuit 2-2 links to each other with the gate pole trigger end of M group thyristor switchable capacitor TSC respectively, controller 2-1 connects TSC drive circuit 2-3 to realize the control to SVG drive circuit 2-3 by the second optical coupling isolation circuit 2-5, and 6 control signal output ends of SVG drive circuit 2-3 link to each other with 6 gate pole trigger ends of static reacance generator SVG respectively.
Controller 2-1 described in the present embodiment adopts the mode of DSP and CPLD associating to control.DSP, i.e. digital signal processor is because it has powerful data-handling capacity and the outstanding speed of service is mainly used in data acquisition and processing (DAP) in native system; CPLD, promptly CPLD is mainly used in control owing to it has good real-time observation and control ability in native system.
The present invention adopts the mode of Passive Reactive Power Compensation and active reactive power compensation combined reactive compensation that network system is carried out reactive power compensation, when idle the changing in the load, in described a kind of reactive power compensation and the harmonic wave governing system, thyristor switchable capacitor TSC is to the required idle grading compensation that carries out, static reacance generator SVG to thyristor switchable capacitor TSC at different levels between idle the compensating of residue.Controller 2-1 of the present invention adopts full digital control method, makes described a kind of reactive power compensation and harmonic wave governing system still have good dynamic characteristics and stable state accuracy under the violent situation of the fluctuation of load.When containing harmonic current in the load, static reacance generator SVG realizes the harmonic current that contains in the load is filtered, suppress thyristor switchable capacitor TSC and system's generation resonance, therefore, the wave arrestment reactor of need not connecting again in every branch road of thyristor switchable capacitor TSC is saved system cost.The present invention provides a kind of to loading on the high performance-price ratio scheme that contains the idle quick and continuous compensation of big capacity under the harmonic current environment in conjunction with rapidity and the continuity and the cost advantage of thyristor switchable capacitor TSC when the big capacity of compensation is idle of static reacance generator SVG to reactive power compensation.
Embodiment two: the difference of present embodiment and embodiment one described a kind of reactive power compensation and harmonic wave governing system is:
Described
MGroup thyristor switchable capacitor TSC, the value of building-out capacitor C is to determine according to predefined thyristor switchable capacitor TSC compensation capacity value among the m group thyristor switchable capacitor TSC, wherein, m is the natural number from 1 to M.
Present embodiment is the further supplementary notes to the capacitance of building-out capacitor C among the thyristor switchable capacitor TSC in the embodiment one, the capacitance of building-out capacitor C is to determine that according to the compensation capacity of thyristor switchable capacitor TSC present embodiment preestablishes
MGroup thyristor switchable capacitor TSC is respectively according to 2 of unit compensation capacity
n-1
Doubly carry out the capacity compensation, adopt this kind coded system compensation thyristor switchable capacitor TSC capacity,
M1 times, 2 times, 4 times of the compensation capacity unit of the being respectively compensation capacity of group thyristor switchable capacitor TSC ..., 2
N-1Doubly, wherein,
nBe 1 to the natural number of N, N is the natural number that is not more than M.
Not on the same group among the thyristor switchable capacitor TSC capacitance of building-out capacitor C can equate, therefore,
MAmong the group thyristor switchable capacitor TSC the identical thyristor switchable capacitor TSC of compensation capacity can be arranged.
Embodiment three: specify present embodiment below in conjunction with Fig. 1, Fig. 2, Fig. 3.Use a kind of reactive power compensation described in the embodiment one and harmonic wave governing system and realize the control method of reactive power compensation and harmonic wave control, the process of reactive power compensation and harmonic wave control is:
The instantaneous value of step 1, detection of grid a phase current
i SaAnd the instantaneous value of electrical network c phase current
i Sc, the instantaneous value of detection load a phase current
i LaAnd the instantaneous value of load c phase current
i Lc, the instantaneous value of a phase current of detection static reacance generator SVG output
i FaAnd the instantaneous value of the c phase current of static reacance generator SVG output
i Fc, the instantaneous value of detection static reacance generator SVG DC bus-bar voltage
u Dc
The instantaneous value of the load a phase current that step 2, controller 2-1 obtain according to sampling
i LaAnd the instantaneous value of load c phase current
i Lc, utilize thyristor switchable capacitor TSC switching rule to calculate the switching compound mode of thyristor switchable capacitor TSC
W, TSC drive circuit 2-2 sends TSC switching signal
S 1~
S M To finish above-mentioned switching mode combination;
The instantaneous value of the electrical network a phase current that step 3, controller 2-1 obtain according to sampling
i SaAnd the instantaneous value of electrical network c phase current
i Sc, utilize instantaneous reactive power theory to calculate the command value of static reacance generator SVG offset current
i * Fa
The instantaneous value of a phase current that the static reacance generator SVG that step 4, controller 2-1 obtain according to sampling exports
i Fa, static reacance generator SVG output the instantaneous value of c phase current
i Fc, static reacance generator SVG DC bus-bar voltage instantaneous value
u DcAnd the static reacance generator SVG offset current command value that in step 3, obtains
i * Fa, adopt the Direct Current Control method to generate pwm signal, SVG drive circuit 2-3 sends SVG switching signal
P 1~
P 6
The present invention adopts the mode of Passive Reactive Power Compensation and active reactive power compensation combined reactive compensation that network system is carried out reactive power compensation, when idle the changing in the load, thyristor switchable capacitor TSC calculates the switching compound mode of thyristor switchable capacitor TSC according to TSC switching rule
W,TSC drive circuit 2-2 sends TSC switching signal
S 1~
S M To finish above-mentioned switching mode combination, to the required idle grading compensation that carries out, static reacance generator SVG utilizes instantaneous reactive power theory to calculate the command value of static reacance generator offset current
i * Fa, to thyristor switchable capacitor TSC at different levels between the residue idle compensating.When containing harmonic current in the load, realize filtration to the harmonic current that contains in the load suppressing thyristor switchable capacitor TSC and system's generation resonance by static reacance generator SVG.
In the three-phase three-wire system electric power system, a, b, c three-phase measuring amount sum are zero, therefore, only need to measure two phase parameters, and custom adopts a, c two-phase are measured on the engineering.Described in the present embodiment electrical network a is reached calculating and the judgement that the c phase current values is done mutually, also can expand to any two-phase in the electrical network three-phase.
Among Fig. 3, what ordinate was represented is compensation capacity, usually, with the inductive reactive power compensation capacity be defined as on the occasion of, the capacitive reactive power compensation capacity is defined as negative value.
Q FmaxWhat represent is thyristor switchable capacitor TSC unit compensation capacity,
Q LmaxExpression be maximum with the required compensation capacity of network system, be that perception is idle ,-
Q LmaxThe capacitive reactive power of expression.
Embodiment four: specify present embodiment below in conjunction with Fig. 1, Fig. 4.Present embodiment and execution mode a kind of reactive power compensation of three described application and harmonic wave governing system realize that the control method difference of reactive power compensation and harmonic wave control is:
In step 2, described thyristor switchable capacitor TSC switching rule is:
Step 2 one, general
MGroup thyristor switchable capacitor TSC according to compensation capacity sort from small to large be the 1st group, the 2nd group ...,
MGroup;
Step 2 two,
MGroup thyristor switchable capacitor TSC realizes that according to different switching compound modes the Passive Reactive Power Compensation capacity has 2
M -a kind of combination with the Passive Reactive Power Compensation capacity by compiling from small to large is
Q 1,
Q 2...,
Step 2 three, can obtain the Passive Reactive Power Compensation capacity by step 2 one and step 2 two
Q 1,
Q 2...,
With thyristor switchable capacitor TSC switching compound mode
W 1,
W 2...,
Shine upon one by one
Q-WRelated table;
Step 2 four, the required reactive compensation capacity of network system are
Q L, when
Q j＜
Q L＜
Q J+1The time, select the switching compound mode
W j
Present embodiment is that the switching rule of thyristor switchable capacitor TSC in the embodiment three is done further supplementary notes, will
MGroup thyristor switchable capacitor TSC sorts from small to large according to compensation capacity,
MGroup thyristor switchable capacitor TSC can have 2
M -a kind of switching compound mode
W 1,
W 2...,
, corresponding just can obtain 2
M -a kind of Passive Reactive Power Compensation capacity
Q 1,
Q 2...,
, the Passive Reactive Power Compensation capacity
QBy sequence arrangement from small to large, make the Passive Reactive Power Compensation capacity
QWith thyristor switchable capacitor TSC switching compound mode
WBe mapped to
Q-WThe form of related table.The concrete reactive compensation capacity required according to electrical network
Q L, judge its
Q-WPromptly work as the position at place in the related table
Q LBe positioned at (
Q j,
Q J+1) between the time, choose the switching compound mode
W j, TSC drive circuit 2-2 sends
MGroup TSC switching signal
S 1~
S M
This process has realized TSC switching compound mode determined that thyristor switchable capacitor TSC can realize automatic switching, has finished thyristor switchable capacitor TSC to idle grading compensation.
Embodiment five: specify present embodiment below in conjunction with Fig. 1.Present embodiment and embodiment a kind of reactive power compensation of three described application and harmonic wave governing system realize that the control method difference of reactive power compensation and harmonic wave control is:
In step 3, the instantaneous value of the electrical network a phase current that controller 2-1 obtains according to sampling
i SaAnd the instantaneous value of electrical network c phase current
i Sc, go out reactive current and harmonic current components sum in the power network current based on the instantaneous reactive Theoretical Calculation
i Saq, adopt
i * Fa=
Ki SaqControl strategy is determined static reacance generator SVG offset current command value
i * Fa, wherein, k is calculated by the SVG cancellation ratio B that hope reaches, k=B/ (1-B).
Present embodiment is the supplementary notes to embodiment three, and described a kind of reactive power compensation and harmonic wave governing system obtain static reacance generator SVG offset current command value according to said method
i * Fa, be value of feedback with static reacance generator SVG output current, adopt the Direct Current Control method to generate six groups of signals of PWM
P 1~
P 6, the break-make of three-phase full-bridge inverter switching device among the control static reacance generator SVG after SVG drive circuit 2-3 power amplification.
Claims (5)
1. reactive power compensation and harmonic wave governing system, it is characterized in that: it is made up of Passive Reactive Power Compensation part (1), control section (2) and active reactive power compensation and harmonic wave control part (3), Passive Reactive Power Compensation part (1) and active reactive power compensation and harmonic wave control part (3) access in parallel electrical network
Described Passive Reactive Power Compensation part (1) is composed in parallel by M group thyristor switchable capacitor (TSC), thyristor valve group and compensation condenser C that the thyristor of two reverse parallel connections (D) constitutes are connected into a branch road, three groups of described branch roads adopt the triangle connected mode to connect and compose one group of thyristor switchable capacitor (TSC), tie point is linked into respectively in the three-phase of electrical network, wherein, M is the integer greater than 1
Described active reactive power compensation and harmonic wave control part (3) are made up of a static reacance generator (SVG) and three inductance (L), static reacance generator (SVG) is made up of the voltage-source type three-phase full-bridge inverter, the three-phase output end of voltage-source type three-phase full-bridge inverter connects an end of an inductance (L) respectively, the other end of three inductance (L) is connected respectively in the three-phase of electrical network
Described control section (2) is by controller (2-1), TSC drive circuit (2-2), SVG drive circuit (2-3), first optical coupling isolation circuit (2-4) and second optical coupling isolation circuit (2-5) are formed, controller (2-1) connects TSC drive circuit (2-2) to realize the control to TSC drive circuit (2-2) by first optical coupling isolation circuit (2-4), M control signal output ends of TSC drive circuit (2-2) links to each other with the gate pole trigger end of M group thyristor switchable capacitor (TSC) respectively, controller (2-1) connects SVG drive circuit (2-3) to realize the control to SVG drive circuit (2-3) by second optical coupling isolation circuit (2-5), and 6 control signal output ends of SVG drive circuit (2-3) link to each other with 6 gate pole trigger ends of static reacance generator (SVG) respectively.
2. a kind of reactive power compensation according to claim 1 and harmonic wave governing system is characterized in that:
Described
MGroup thyristor switchable capacitor (TSC), the value of building-out capacitor C is to determine according to predefined thyristor switchable capacitor (TSC) compensation capacity value in the m group thyristor switchable capacitor (TSC), wherein, m is the natural number from 1 to M.
3. application rights requires 1 described a kind of reactive power compensation and harmonic wave governing system to realize the control method of reactive power compensation and harmonic wave control, it is characterized in that:
The process of reactive power compensation and harmonic wave control is:
The instantaneous value of step 1, detection of grid a phase current
i SaAnd the instantaneous value of electrical network c phase current
i Sc, the instantaneous value of detection load a phase current
i LaAnd the instantaneous value of load c phase current
i Lc, the instantaneous value of a phase current of detection static reacance generator (SVG) output
i FaAnd the instantaneous value of the c phase current of static reacance generator (SVG) output
i Fc, the instantaneous value of detection static reacance generator (SVG) DC bus-bar voltage
u Dc
The instantaneous value of the load a phase current that step 2, controller (2-1) obtain according to sampling
i LaAnd the instantaneous value of load c phase current
i Lc, utilize thyristor switchable capacitor (TSC) switching rule to calculate the switching compound mode of thyristor switchable capacitor (TSC)
W, TSC drive circuit (2-2) sends TSC switching signal
S 1~
S M To finish above-mentioned switching mode combination;
The instantaneous value of the electrical network a phase current that step 3, controller (2-1) obtain according to sampling
i SaAnd the instantaneous value of electrical network c phase current
i Sc, utilize instantaneous reactive power theory to calculate the command value of static reacance generator (SVG) offset current
i * Fa
The instantaneous value of a phase current of static reacance generator (SVG) output that step 4, controller (2-1) obtain according to sampling
i Fa, static reacance generator (SVG) output the instantaneous value of c phase current
i Fc, static reacance generator (SVG) DC bus-bar voltage instantaneous value
u DcAnd static reacance generator (SVG) the offset current command value that in step 3, obtains
i * Fa, adopt the Direct Current Control method to generate pwm signal, SVG drive circuit (2-3) sends SVG switching signal
P 1~
P 6
4. a kind of reactive power compensation of application according to claim 3 and harmonic wave governing system are realized the control method of reactive power compensation and harmonic wave control, it is characterized in that:
In step 2, described thyristor switchable capacitor (TSC) switching rule is:
Step 2 one, general
MThe group thyristor switchable capacitor (TSC) according to compensation capacity sort from small to large be the 1st group, the 2nd group ...,
MGroup;
Step 2 two,
MGroup thyristor switchable capacitor (TSC) realizes that according to different switching compound modes the Passive Reactive Power Compensation capacity has 2
M -a kind of combination with the Passive Reactive Power Compensation capacity by compiling from small to large is
Q 1,
Q 2...,
Step 2 three, can obtain the Passive Reactive Power Compensation capacity by step 2 one and step 2 two
Q 1,
Q 2...,
With thyristor switchable capacitor (TSC) switching compound mode
W 1,
W 2...,
Shine upon one by one
Q-WRelated table;
Step 2 four, the required reactive compensation capacity of network system are
Q L, when
Q j＜
Q L＜
Q J+1The time, select the switching compound mode
W j
5. a kind of reactive power compensation of application according to claim 3 and harmonic wave governing system are realized the control method of reactive power compensation and harmonic wave control, it is characterized in that:
In step 3, the instantaneous value of the electrical network a phase current that controller (2-1) obtains according to sampling
i SaAnd the instantaneous value of electrical network c phase current
i Sc, go out reactive current and harmonic current components sum in the power network current based on the instantaneous reactive Theoretical Calculation
i Saq, adopt
i * Fa=
Ki SaqControl strategy is determined static reacance generator (SVG) offset current command value
i * Fa, wherein, k is calculated by the SVG cancellation ratio B that hope reaches, k=B/ (1-B).
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| CN102082439A (en) * | 2011-01-25 | 2011-06-01 | 深圳市华冠电气有限公司 | Method and device for optimizing quality of electric energy |
| CN102435881A (en) * | 2011-09-22 | 2012-05-02 | 绍兴电力局 | Test circuit of dynamic reactive power compensation and harmonic control device and test method thereof |
| CN102810872A (en) * | 2012-08-22 | 2012-12-05 | 广东电网公司江门供电局 | Power compensation method and power compensation system for power distribution network |
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