CN105375490A - Energy-saving power transmission voltage compensation method - Google Patents
Energy-saving power transmission voltage compensation method Download PDFInfo
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- CN105375490A CN105375490A CN201510979068.3A CN201510979068A CN105375490A CN 105375490 A CN105375490 A CN 105375490A CN 201510979068 A CN201510979068 A CN 201510979068A CN 105375490 A CN105375490 A CN 105375490A
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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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- Supply And Distribution Of Alternating Current (AREA)
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Abstract
The invention discloses an energy-saving power transmission voltage compensation method. Through the method, a wattless condition of a power transmission line and a fluctuation condition of a voltage can be instantly and accurately detected, a reactive compensation capacitor is adaptively switched, dynamic compensation for the power transmission voltage is real-time, stepless and adjustable; and, even in the condition that a fault occurs in the power transmission line, the voltage of a power transmission network can be still maintained to be stable, operation optimization of reactive compensation equipment is achieved, and electric energy is effectively saved.
Description
Technical field
The present invention relates to a kind of energy-conservation transmission voltage compensation method.
Background technology
China's current power transmission system, also exist that radius of electricity supply is large, seaonal load variation is large, circuit reactive loss is large, power factor is low, reactive power can not the problem such as in-situ balancing, particularly because the existence of non-linear, impact a large amount of in industrial production and wavy load brings day by day serious power quality problem to electrical network, the serious voltage stabilization that have impact on electrical network, threatens the normal operation of electric power system and subscriber equipment.
In addition, along with a large amount of transmission system of distributed power source, new feature is brought to the operation of transmission system and control.Because distributed power source affects greatly by Changes in weather, have the characteristic of change at random, make system load flow have the characteristic of change at random, therefore the access of distributed power source will increase the fluctuation of system voltage.In order to suppress system voltage to fluctuate, need configuration dynamic reactive compensation device to suppress voltage fluctuation
Reactive power compensation technology is all the study hotspot in electrical engineering field all the time, compared with SVC dynamic reactive compensator, static reacance generator have the make-up time fast, can Continuous Compensation, not easily produce resonance, the advantages such as the harmonic wave of certain time can be compensated.
SVG prior art switching determination strategy, is divided into power factor controlling mode, voltage control mode, reactive current control mode, Reactive Power Control mode and complex controll mode by control physical quantity.Described complex controll mode comprises again voltage and reactive power complex controll mode, reactive power and power factor complex controll mode, and voltage and power factor complex controll mode.
In the steady state, existing method can by voltage stabilization to rated value.But when change in voltage steepness is larger, especially when transmission line breaks down, existing reactive power compensator can not compensate fast to idle change, can not good burning voltage.
Reactive Power Optimization Algorithm for Tower in transmission system is a very complicated problem.It is by the large-scale nonlinear problem set of multiple constraints, multiple performance variable, multiple target function altogether.Solve Reactive Power Optimazation Problem, first practical problem must be converted into Mathematical Modeling, and on this basis, obtain optimal solution.Mainly Reactive Power Optimization Algorithm for Tower is divided into two classes at present, a class is classical Reactive Power Optimization Algorithm for Tower, and another kind of is artificial intelligence Reactive Power Optimization Algorithm for Tower.The requirement that classical Reactive Power Optimization Algorithm for Tower is chosen because its Mathematical Modeling is complicated, to initial point is higher, does not possess the shortcomings such as real-time, is replaced gradually by artificial optimization's algorithm.
Summary of the invention
For solving the problem, the invention provides a kind of energy-conservation transmission voltage compensation method, pass through the method, immediately can detect the fluctuation situation of the idle of power transmission line and voltage accurately, carry out switching reactive compensation capacitor adaptively, the dynamic compensation that real time stepless is adjustable to transmission voltage, even if when transmission line breaks down, still can maintain the voltage stabilization of power transmission network, and realize reactive-load compensation equipment operation optimization, effective saves energy.
To achieve these goals, the invention provides a kind of energy-conservation transmission voltage compensation method, the method concrete steps are as follows:
S1. the voltage and current information of the monitoring point of the first voltage sample module and the first current sample module real-time collecting power transmission line, and by the voltage and current information transmission that the collects signal gathering unit to control module;
S2. signal gathering unit obtains voltage, the information such as idle and meritorious through computing;
S3. fault identification unit carries out judging that whether current transmission line is normal according to current voltage information; If normally enter step S4, enter step S5 if abnormal;
S4. carry out the control of reactive power compensating by normal control unit, realize the stable of transmission voltage;
S5. carry out the control of reactive power compensating by faulty control unit, realize the stable of transmission voltage.
Preferably, in step s3, judge that whether current transmission line is normal in the following way:
The critical value of Voltage Drop is set to U by fault identification unit
l1, recover critical value and be set to U
l2, wherein U
l1< U
l2;
When voltage is lower than U
l1time exceed fall trigger differentiation time Δ t
l1time, fault identification unit judges that electrical network current state is Voltage Drop fault; Now exporting malfunction flag bit is flag=1;
When returning to U from malfunction after Voltage Drop
12time exceed fall recover differentiation time Δ t
l2time, fault identification unit judges that electrical network current state is voltage resume, and now exporting malfunction flag bit is flag=0;
The critical value that voltage raises is set to U by fault identification unit
h1, recover critical value and be set to U
h2, wherein U
h2< U
h1;
When voltage is higher than U
h1time exceed raise trigger differentiation time Δ t
h1time, fault identification unit judges that electrical network current state is overtension fault, and now exporting malfunction flag bit is flag=1, activates faulty control unit;
When voltage is lower than U
h2time exceed raise recover differentiation time Δ t
h2time, fault identification unit judges that electrical network current state is that voltage resume is normal, and now exporting malfunction flag bit is flag=0, stops faulty control unit.
Preferably, in step s 4 which, specifically comprise the steps:
Normal control unit controls the control point under nominal situation according to control strategy; Control strategy comprises constant voltage control strategy, power limitation control strategy and constant power factor control strategy.
Preferably, constant voltage control strategy is used for the voltage at control point to maintain in voltage reference value scope [Umin, Umax], and the reactive power reference qref Qsvg_ref of the reactive power compensator under constant voltage control strategy is:
Wherein,
In above formula, K is proportionality constant, and T is integration time constant, and Δ U is voltage deviation error, U
maxfor voltage max; U
pccfor busbar voltage; U
minfor voltage minimum;
Power limitation control strategy is used for the reactive power value at control point to be maintained reactive power reference qref Q
ref, the reactive power reference qref Q of the reactive power compensator under power limitation control strategy
svg_reffor:
Wherein,
In above formula, K is proportionality constant, and T is integration time constant, and Δ U is voltage deviation error, U
maxfor voltage max; U
pccfor busbar voltage; U
minfor voltage minimum;
Power limitation control strategy is used for the reactive power value at control point to be maintained reactive power reference qref Q
ref, the reactive power reference qref Qsvg_ref of the reactive power compensator under power limitation control strategy is:
In above formula, Q
reffor the reactive power reference qref at control point; Q
pccfor the reactive power at control point; Q
svgfor reactive power compensator access point reactive power;
Constant power factor control strategy is used for the power factor at control point to be maintained power factor reference value PF
ref, the reactive power reference qref Q of the reactive power compensator under constant power factor control strategy
svg_reffor:
In above formula, PFref is the power factor reference value at control point; Ppcc, Qpcc are active power, the reactive power at control point;
Conversion between constant voltage control strategy, power limitation control strategy and constant power factor control strategy is realized by change control parameter.
Preferably, in reactive power compensation process, following steps can be adopted to start reactive compensation system:
S61. control module judge the magnitude of voltage of power transmission line and frequency values whether normal;
S62. until bus voltage value and frequency values normal time, closed main contactor, is connected voltage compensation system with electrical network, enters pre-charging stage;
S63. after described pre-charging stage terminates, control module carries out dq coordinate transform and phase-locked to the power transmission line three-phase voltage signal gathered, and obtains electric voltage frequency and the phase information of power transmission line;
S64. control module utilizes the electric voltage frequency and phase information that obtain, by the sine pulse width modulation (PWM) ripple signal that computing generation is synchronous with line voltage, exports three phase inverter bridge to by inverter circuit controller;
S65. adopt open loop control mode progressively to reduce described sine pulse width modulation (PWM) wave modulation ratio, until the DC voltage of SVG equipment reaches load voltage value, enter the follow-up operation stage.
Further, pre-charge process described in step S62, electrical network forms three-phase uncontrollable rectifier circuit by the anti-paralleled diode in IGCT three phase inverter bridge and charges to DC bus capacitor device, second voltage sample module and the second current sample module, detect voltage and the charging current value of SVG equipment, when DC bus capacitor device magnitude of voltage is stable and charging current is zero, pre-charging stage terminates.
One provided by the invention energy-saving transmission voltage compensation method tool has the following advantages: (1) can based on the electric current and voltage information of multiple nodes of the power transmission line of Real-time Obtaining, and real-time analysis judges voltage, idle and active state that power transmission line is current.(2) reactive power compensation under voltage normal fluctuation state can be tackled, also can tackle the reactive power compensation under the fault that voltage sharply declines, improve the threshold value that bus voltage compensates.
Accompanying drawing explanation
Fig. 1 shows the block diagram of a kind of energy-saving transmission voltage bucking-out system of the present invention;
Fig. 2 has illustrated a kind of energy-conservation transmission voltage compensation method of the present invention.
Embodiment
Fig. 1 shows a kind of block diagram of energy-saving transmission voltage bucking-out system, and this system comprises:
First voltage sample module 10, for the information of voltage of the multiple spot of Real-time Collection power transmission line 1;
First current sample module 9, for the information of voltage of the multiple spot of Real-time Collection power transmission line 1;
SVG equipment 4, for providing capacitive reactive power for electric power transmission network;
Main contactor 2, is same as the connection that voltage compensation system and power transmission line 1 can be turned off;
Three-phase inverter bridge circuit 3, one end is connected with above-mentioned SVG equipment 4, and the other end connects main contactor;
Inverter circuit controller 7, for controlling the shutoff of the electronic switch of three-phase inverter bridge circuit 3, thus controls idle compensation rate;
Control module 8, for controlling the collaborative work of this voltage compensation system all parts, this control module 8 comprises: signal gathering unit 81, normal control unit 82, faulty control unit 83 and fault identification unit 84, wherein:
The input of signal gathering unit 81 is connected to the first voltage acquisition module 10 and the first current acquisition module 9, and output is connected to normal control unit 82 and fault identification unit 83;
Fault identification unit 83 is connected 84 with faulty control unit;
The output of normal control unit 82 and faulty control unit 84 is connected to inverter circuit controller 7 and main contactor 2 respectively, for control inverter circuit 7 and main contactor 2.
Preferably, signal gathering unit 81 is for receiving the voltage and current information collected from the first voltage acquisition module 10 and the first current acquisition module 9, and then obtain voltage, the data message such as active power and reactive power of power transmission line, and export described data message to normal control unit 81 and fault identification unit 82 through first order inertial loop.
Preferably, normal control unit 81 controls the control point under nominal situation according to control strategy; Control strategy comprises constant voltage control strategy, power limitation control strategy and constant power factor control strategy.
Preferably, constant voltage control strategy is used for the voltage at control point to maintain in voltage reference value scope [Umin, Umax], and the reactive power reference qref Qsvg_ref of the reactive power compensator under constant voltage control strategy is:
Wherein,
In above formula, K is proportionality constant, and T is integration time constant, and Δ U is voltage deviation error, U
maxfor voltage max; U
pccfor busbar voltage; U
minfor voltage minimum;
Power limitation control strategy is used for the reactive power value at control point to be maintained reactive power reference qref Q
ref, the reactive power reference qref Q of the reactive power compensator under power limitation control strategy
svg_reffor:
Wherein,
In above formula, K is proportionality constant, and T is integration time constant, and Δ U is voltage deviation error, U
maxfor voltage max; U
pccfor busbar voltage; U
minfor voltage minimum;
Power limitation control strategy is used for the reactive power value at control point to be maintained reactive power reference qref Q
ref, the reactive power reference qref Qsvg_ref of the reactive power compensator under power limitation control strategy is:
In above formula, Q
reffor the reactive power reference qref at control point; Q
pccfor the reactive power at control point; Q
svgfor reactive power compensator access point reactive power;
Constant power factor control strategy is used for the power factor at control point to be maintained power factor reference value PF
ref, the reactive power reference qref Q of the reactive power compensator under constant power factor control strategy
svg_reffor:
In above formula, PFref is the power factor reference value at control point; Ppcc, Qpcc are active power, the reactive power at control point;
Conversion between constant voltage control strategy, power limitation control strategy and constant power factor control strategy is realized by change control parameter.
Preferably, faulty control unit 84, in case of a fault, carries out proportional integral computing according to the voltage deviation value of controling parameters to control point, obtains the reactive power reference qref of reactive power compensator; Controling parameters comprises pi regulator parameter K
fand T
f, Voltage Drop critical value U
l1, voltage raises critical value U
h1, input signal is control point voltage U
pcc, output signal the reactive power reference qref Q into reactive power compensator
svg_ref:
Fault identification unit 82 judges according to the failure condition of voltage magnitude to power transmission network with control point and provides malfunction position, and carry out critical voltage Hysteresis control and fault time dead zone function.
Preferably, the critical value of Voltage Drop is set to U by fault identification unit
l1, recover critical value and be set to U
l2, wherein U
l1< U
l2;
When voltage is lower than U
l1time exceed fall trigger differentiation time Δ t
l1time, fault identification unit judges that electrical network current state is Voltage Drop fault; Now exporting malfunction flag bit is flag=1;
When returning to U from malfunction after Voltage Drop
12time exceed fall recover differentiation time Δ t
l2time, fault identification unit judges that electrical network current state is voltage resume, and now exporting malfunction flag bit is flag=0;
The critical value that voltage raises is set to U by fault identification unit
h1, recover critical value and be set to U
h2, wherein U
h2< U
h1;
When voltage is higher than U
h1time exceed raise trigger differentiation time Δ t
h1time, fault identification unit judges that electrical network current state is overtension fault, and now exporting malfunction flag bit is flag=1, activates faulty control unit;
When voltage is lower than U
h2time exceed raise recover differentiation time Δ t
h2time, fault identification unit judges that electrical network current state is that voltage resume is normal, and now exporting malfunction flag bit is flag=0, stops faulty control unit.
Preferably, when faulty control unit is activated, normal control unit stops to export control signal.
Preferably, described three-phase inverter bridge circuit adopts IGCT three phase inverter bridge.
Preferably, described system also comprises the second voltage acquisition module and the second current acquisition module of the voltage and current information for gathering SVG equipment.
Figure 2 illustrate the energy-conservation transmission voltage compensation method of one of the present invention, the method concrete steps are as follows:
S1. the voltage and current information of the monitoring point of the first voltage sample module and the first current sample module real-time collecting power transmission line, and by the voltage and current information transmission that the collects signal gathering unit to control module;
S2. signal gathering unit obtains voltage, the information such as idle and meritorious through computing;
S3. fault identification unit carries out judging that whether current transmission line is normal according to current voltage information; If normally enter step S4, enter step S5 if abnormal;
S4. carry out the control of reactive power compensating by normal control unit, realize the stable of transmission voltage;
S5. carry out the control of reactive power compensating by faulty control unit, realize the stable of transmission voltage.
Preferably, in step s3, judge that whether current transmission line is normal in the following way:
The critical value of Voltage Drop is set to U by fault identification unit
l1, recover critical value and be set to U
l2, wherein U
l1< U
l2;
When voltage is lower than U
l1time exceed fall trigger differentiation time Δ t
l1time, fault identification unit judges that electrical network current state is Voltage Drop fault; Now exporting malfunction flag bit is flag=1;
When returning to U from malfunction after Voltage Drop
12time exceed fall recover differentiation time Δ t
l2time, fault identification unit judges that electrical network current state is voltage resume, and now exporting malfunction flag bit is flag=0;
The critical value that voltage raises is set to U by fault identification unit
h1, recover critical value and be set to U
h2, wherein U
h2< U
h1;
When voltage is higher than U
h1time exceed raise trigger differentiation time Δ t
h1time, fault identification unit judges that electrical network current state is overtension fault, and now exporting malfunction flag bit is flag=1, activates faulty control unit;
When voltage is lower than U
h2time exceed raise recover differentiation time Δ t
h2time, fault identification unit judges that electrical network current state is that voltage resume is normal, and now exporting malfunction flag bit is flag=0, stops faulty control unit.
Preferably, in step s 4 which, specifically comprise the steps:
Normal control unit controls the control point under nominal situation according to control strategy; Control strategy comprises constant voltage control strategy, power limitation control strategy and constant power factor control strategy.
Preferably, constant voltage control strategy is used for the voltage at control point to maintain in voltage reference value scope [Umin, Umax], and the reactive power reference qref Qsvg_ref of the reactive power compensator under constant voltage control strategy is:
Wherein,
In above formula, K is proportionality constant, and T is integration time constant, and Δ U is voltage deviation error, U
maxfor voltage max; U
pccfor busbar voltage; U
minfor voltage minimum;
Power limitation control strategy is used for the reactive power value at control point to be maintained reactive power reference qref Q
ref, the reactive power reference qref Q of the reactive power compensator under power limitation control strategy
svg_reffor:
Wherein,
In above formula, K is proportionality constant, and T is integration time constant, and Δ U is voltage deviation error, U
maxfor voltage max; U
pccfor busbar voltage; U
minfor voltage minimum;
Power limitation control strategy is used for the reactive power value at control point to be maintained reactive power reference qref Q
ref, the reactive power reference qref Qsvg_ref of the reactive power compensator under power limitation control strategy is:
In above formula, Q
reffor the reactive power reference qref at control point; Q
pccfor the reactive power at control point; Q
svgfor reactive power compensator access point reactive power;
Constant power factor control strategy is used for the power factor at control point to be maintained power factor reference value PF
ref, the reactive power reference qref Q of the reactive power compensator under constant power factor control strategy
svg_reffor:
In above formula, PFref is the power factor reference value at control point; Ppcc, Qpcc are active power, the reactive power at control point;
Conversion between constant voltage control strategy, power limitation control strategy and constant power factor control strategy is realized by change control parameter.
Preferably, in step s 5, specifically comprise the steps:
Faulty control unit is used in case of a fault, carries out proportional integral computing, obtain the reactive power reference qref of reactive power compensator according to the voltage deviation value of controling parameters to control point; Controling parameters comprises pi regulator parameter K
fand T
f, Voltage Drop critical value U
l1, voltage raises critical value U
h1, input signal is control point voltage U
pcc, output signal the reactive power reference qref Q into reactive power compensator
svg_ref:
Fault identification unit judges according to the failure condition of voltage magnitude to power transmission network with control point and provides malfunction position, and carry out critical voltage Hysteresis control and fault time dead zone function.
Preferably, in reactive power compensation process, following steps can be adopted to start reactive compensation system:
S61. control module judge the magnitude of voltage of power transmission line and frequency values whether normal;
S62. until bus voltage value and frequency values normal time, closed main contactor, is connected voltage compensation system with electrical network, enters pre-charging stage;
S63. after described pre-charging stage terminates, control module carries out dq coordinate transform and phase-locked to the power transmission line three-phase voltage signal gathered, and obtains electric voltage frequency and the phase information of power transmission line;
S64. control module utilizes the electric voltage frequency and phase information that obtain, by the sine pulse width modulation (PWM) ripple signal that computing generation is synchronous with line voltage, exports three phase inverter bridge to by inverter circuit controller;
S65. adopt open loop control mode progressively to reduce described sine pulse width modulation (PWM) wave modulation ratio, until the DC voltage of SVG equipment reaches load voltage value, enter the follow-up operation stage.
Further, pre-charge process described in step S62, electrical network forms three-phase uncontrollable rectifier circuit by the anti-paralleled diode in IGCT three phase inverter bridge and charges to DC bus capacitor device, second voltage sample module and the second current sample module, detect voltage and the charging current value of SVG equipment, when DC bus capacitor device magnitude of voltage is stable and charging current is zero, pre-charging stage terminates.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, make some equivalent to substitute or obvious modification, and performance or purposes identical, all should be considered as belonging to protection scope of the present invention.
Claims (6)
1. an energy-conservation transmission voltage compensation method, the method concrete steps are as follows:
S1. the voltage and current information of the monitoring point of the first voltage sample module and the first current sample module real-time collecting power transmission line, and by the voltage and current information transmission that the collects signal gathering unit to control module;
S2. signal gathering unit obtains voltage, the information such as idle and meritorious through computing;
S3. fault identification unit carries out judging that whether current transmission line is normal according to current voltage information; If normally enter step S4, enter step S5 if abnormal;
S4. carry out the control of reactive power compensating by normal control unit, realize the stable of transmission voltage;
S5. carry out the control of reactive power compensating by faulty control unit, realize the stable of transmission voltage.
2. the method for claim 1, is characterized in that, in step s3, judges that whether current transmission line is normal in the following way:
The critical value of Voltage Drop is set to U by fault identification unit
l1, recover critical value and be set to U
l2, wherein U
l1< U
l2;
When voltage is lower than U
l1time exceed fall trigger differentiation time Δ t
l1time, fault identification unit judges that electrical network current state is Voltage Drop fault; Now exporting malfunction flag bit is flag=1;
When returning to U from malfunction after Voltage Drop
12time exceed fall recover differentiation time Δ t
l2time, fault identification unit judges that electrical network current state is voltage resume, and now exporting malfunction flag bit is flag=0;
The critical value that voltage raises is set to U by fault identification unit
h1, recover critical value and be set to U
h2, wherein U
h2< U
h1;
When voltage is higher than U
h1time exceed raise trigger differentiation time Δ t
h1time, fault identification unit judges that electrical network current state is overtension fault, and now exporting malfunction flag bit is flag=1, activates faulty control unit;
When voltage is lower than U
h2time exceed raise recover differentiation time Δ t
h2time, fault identification unit judges that electrical network current state is that voltage resume is normal, and now exporting malfunction flag bit is flag=0, stops faulty control unit.
3. the method for claim 1, is characterized in that, in step s 4 which, specifically comprises the steps:
Normal control unit controls the control point under nominal situation according to control strategy; Control strategy comprises constant voltage control strategy, power limitation control strategy and constant power factor control strategy.
4. the method for claim 1, it is characterized in that, constant voltage control strategy is used for the voltage at control point to maintain voltage reference value scope [Umin, Umax] in, the reactive power reference qref Qsvg_ref of the reactive power compensator under constant voltage control strategy is:
Wherein,
In above formula, K is proportionality constant, and T is integration time constant, and Δ U is voltage deviation error, U
maxfor voltage max; U
pccfor busbar voltage; U
minfor voltage minimum;
Power limitation control strategy is used for the reactive power value at control point to be maintained reactive power reference qref Q
ref, the reactive power reference qref Q of the reactive power compensator under power limitation control strategy
svg_reffor:
Wherein,
In above formula, K is proportionality constant, and T is integration time constant, and Δ U is voltage deviation error, U
maxfor voltage max; U
pccfor busbar voltage; U
minfor voltage minimum;
Power limitation control strategy is used for the reactive power value at control point to be maintained reactive power reference qref Q
ref, the reactive power reference qref Qsvg_ref of the reactive power compensator under power limitation control strategy is:
In above formula, Q
reffor the reactive power reference qref at control point; Q
pccfor the reactive power at control point; Q
svgfor reactive power compensator access point reactive power;
Constant power factor control strategy is used for the power factor at control point to be maintained power factor reference value PF
ref, the reactive power reference qref Q of the reactive power compensator under constant power factor control strategy
svg_reffor:
In above formula, PFref is the power factor reference value at control point; Ppcc, Qpcc are active power, the reactive power at control point;
Conversion between constant voltage control strategy, power limitation control strategy and constant power factor control strategy is realized by change control parameter.
5. the method for claim 1, is characterized in that, in reactive power compensation process, following steps can be adopted to start reactive compensation system:
S61. control module judge the magnitude of voltage of power transmission line and frequency values whether normal;
S62. until bus voltage value and frequency values normal time, closed main contactor, is connected voltage compensation system with electrical network, enters pre-charging stage;
S63. after described pre-charging stage terminates, control module carries out dq coordinate transform and phase-locked to the power transmission line three-phase voltage signal gathered, and obtains electric voltage frequency and the phase information of power transmission line;
S64. control module utilizes the electric voltage frequency and phase information that obtain, by the sine pulse width modulation (PWM) ripple signal that computing generation is synchronous with line voltage, exports three phase inverter bridge to by inverter circuit controller;
S65. adopt open loop control mode progressively to reduce described sine pulse width modulation (PWM) wave modulation ratio, until the DC voltage of SVG equipment reaches load voltage value, enter the follow-up operation stage.
6. method as claimed in claim 5, it is characterized in that, pre-charge process described in step S62, electrical network forms three-phase uncontrollable rectifier circuit by the anti-paralleled diode in IGCT three phase inverter bridge and charges to DC bus capacitor device, second voltage sample module and the second current sample module, detect voltage and the charging current value of SVG equipment, when DC bus capacitor device magnitude of voltage is stable and charging current is zero, pre-charging stage terminates.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490284A (en) * | 2015-12-24 | 2016-04-13 | 代阿敏 | Energy-saving type transmission voltage compensation system |
| CN111463780A (en) * | 2020-04-24 | 2020-07-28 | 山东太力变频科技有限公司 | Power grid stability control method and system for petroleum drilling machine operation environment |
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| EP1610435A2 (en) * | 1999-09-13 | 2005-12-28 | Aloys Wobben | Method for reactive power control and device for generating electric energy into an electric network |
| CN106558883A (en) * | 2015-09-24 | 2017-04-05 | 中国电力科学研究院 | A kind of electric network fault control system for reactive power compensator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105490284A (en) * | 2015-12-24 | 2016-04-13 | 代阿敏 | Energy-saving type transmission voltage compensation system |
| CN111463780A (en) * | 2020-04-24 | 2020-07-28 | 山东太力变频科技有限公司 | Power grid stability control method and system for petroleum drilling machine operation environment |
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