CN111030163B - Method for regulating voltage of photovoltaic grid-connected point by regions - Google Patents
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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
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a method for regulating the voltage of a photovoltaic grid-connected point by regions, which comprises the following steps: (1) setting a voltage constant value; (2) dividing the region according to the voltage fixed value; (3) judging the area where the photovoltaic grid connection point voltage is located; (4) and (4) regulating the voltage of the photovoltaic grid-connected point by regions according to the result of the step (3). The invention adopts the method of firstly adjusting the reactive power and changing the active power if the reactive power is adjusted to have little influence on the system voltage, thereby solving the problem that the adjustment objects with different access voltage grades are different and conforming to the current situation that the reactive power is more economical; a voltage partition adjusting strategy is adopted, so that different adjusting means of different voltage areas are realized; setting a voltage regulation holding interval to avoid frequent voltage regulation triggering; and an overvoltage and low-voltage locking interval is set, so that the situation that the voltage regulation control is triggered by mistake when the system fails is avoided, and the influence of the fault on the system is aggravated.
Description
Technical Field
The invention relates to the technical field of new energy power generation control, in particular to a method for regulating the voltage of a photovoltaic grid-connected point by regions.
Background
As distributed photovoltaic power generation is connected to the distribution grid, the power flow in the distribution grid is no longer a unidirectional flow from the grid to the load. As the size of the photovoltaic grid connected to the distribution grid increases, the voltage on the feeder can rise even beyond the allowable range. And when the photovoltaic power generation power is small and the load is large, the low voltage is more easily generated at the tail end of the feeder line and exceeds the minimum allowable voltage level. Too high or too low of a voltage can both affect the operation of the equipment at the end of the feeder. Therefore, the method has important significance for controlling the active and reactive output of the photovoltaic according to the voltage of the photovoltaic grid-connected point and further stabilizing the voltage at the tail end of the feeder line.
The voltage drop of the line depends on active power and reactive power transmitted by the line, if the voltage level of the line is higher, the line is sensitive, and the reactive power has larger influence on the voltage drop; otherwise, the circuit is resistive, and the active power has a large influence on the voltage drop. The influence brought by reactive power regulation is that the apparent power is increased due to the increase of the reactive absolute value, and further the line loss is increased; the influence brought by active power is reduced, namely the reduction of the photovoltaic power generation power. From the economic benefit viewpoint, the reactive power for adjusting the equal capacity is more economical than the active power for adjusting the equal capacity. However, the line resistance reactance proportions corresponding to different photovoltaic access voltage classes are different, and in order to adapt to different access voltage classes and reduce the economic loss generated by voltage regulation, a voltage regulation strategy based on reactive power regulation and a voltage regulation strategy based on power factor regulation are not applicable any more.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for regulating the voltage of a photovoltaic grid-connected point by regions, which can adapt to different access voltage grades and reduce the economic loss generated by voltage regulation.
In order to achieve the purpose, the invention is realized by the following technical scheme: a method for adjusting the voltage of a photovoltaic grid-connected point by regions comprises the following steps:
(1) setting a voltage constant value;
(2) dividing the region according to the voltage fixed value;
(3) judging the area where the photovoltaic grid connection point voltage is located;
(4) and (4) regulating the voltage of the photovoltaic grid-connected point by regions according to the result of the step (3).
Further, the voltage setting value set in step (1) includes: voltage upper limit adjusting threshold UhdbThreshold U for adjusting upper limit of locking voltagehlmtThreshold U for adjusting lower voltage limitldbThreshold U for adjusting lower limit of locking voltagellmtVoltage regulation return threshold Uth(ii) a The following magnitude relation is satisfied between the voltage fixed values: u shapellmt<Uldb<Uldb+Uth<Uhdb-Uth<Uhdb<Uhlmt。
Further, the area divided according to the voltage fixed value in the step (2) comprises: (0, U)llmt]、（Ullmt，Uldb]、（Uldb，Uldb+Uth]、（Uldb+Uth，Uhdb-Uth）、[Uhdb-Uth，Uhdb）、[Uhdb，Uhlmt）、[Uhlmt，+∞）。
Further, the specific method for adjusting the voltage of the photovoltaic grid-connected point in the area in the step (4) comprises the following steps:
(a) if the voltage of the current sampling point of the photovoltaic grid-connected point is in the region of (0, U)llmt]If so, the voltage of the current sampling point is not adjusted;
(b) if the voltage of the current sampling point of the photovoltaic grid-connected point is in the region (U)llmt，Uldb]And increasing the reactive power of the photovoltaic inverter and not adjusting the active power of the photovoltaic inverter so as to increase the voltage of the current sampling point, wherein the specific method comprises the following steps:
calculating the value of Q + delta Q;
if Q + delta Q is less than or equal to QmaxThen Q is sent to the photovoltaic invertercmdAn instruction of = Q + Δq;
③ if Q +. DELTA.Q>QmaxThen Q is sent to the photovoltaic invertercmd=QmaxThe instructions of (1);
wherein Q is the reactive output of the photovoltaic before reactive regulation, Delta Q is the step length for regulating the reactive output of the photovoltaic, and QmaxMaximum limit value for the reactive output of photovoltaic, QcmdAnd the photovoltaic reactive power is output after reactive power regulation.
(c) If the voltage of the current sampling point of the photovoltaic grid-connected point is in the region (U)ldb，Uldb+Uth]If so, the voltage of the current sampling point is not adjusted;
(d) if the current sampling point voltage of the photovoltaic grid-connected point is in the region of [ U ]hlmt, + ∞), then the voltage at the current sampling point is not adjusted;
(e) if the current sampling point voltage of the photovoltaic grid-connected point is in the region of [ U ]hdb，Uhlmt) Reducing the reactive power of the photovoltaic inverter firstly and then reducing the active power of the photovoltaic inverter so as to reduce the current sampling voltage, wherein the specific method comprises the following steps:
calculating the value of Q-delta Q;
② if Q-delta Q is more than or equal to Qmin(ii) a Then Q is sent to the photovoltaic invertercmdInstruction of = Q- Δ Q, and no longer adjusts for real power;
③ if Q-delta Q<QminThen Q is sent to the photovoltaic invertercmd=QminAnd then calculating the value of P- Δ P;
if P-delta P is greater than or equal to PminThen P is sent to the photovoltaic invertercmdAn instruction of = P- Δ P;
if P-DELTA P<PminThen P is sent to the photovoltaic invertercmd=PminThe instructions of (1);
wherein Q is the reactive output of the photovoltaic before reactive regulation, Delta Q is the step length for regulating the reactive output of the photovoltaic, and QminFor photovoltaic reactive output minimum limit, QcmdFor the reactive output of the photovoltaic after reactive regulation, P is the active output of the photovoltaic before active regulation, DeltaP is the step length for regulating the active output of the photovoltaic, PminIs the minimum limit value of active output, P, of the photovoltaiccmdFor actively regulating backlightThe active output of the voltage.
(f) If the voltage of the current sampling point of the photovoltaic grid-connected point is in the region (U)ldb+Uth，Uhdb-Uth) And sampling the point voltage slave region (U)llmt，Uldb]When the voltage rises to the region, the reactive power of the photovoltaic inverter is adjusted, and the active power of the photovoltaic inverter is not adjusted, so that the line loss is reduced, and the specific method comprises the following steps:
if Q>Delta Q/2; then Q is sent to the photovoltaic invertercmdAn instruction of = Q- Δ Q;
if Q is less than-delta Q/2, Q is sent to the photovoltaic invertercmdAn instruction of = Q + Δq;
thirdly, if-delta Q/2 is not less than Q and not more than delta Q/2, Q is sent to the photovoltaic invertercmdAn instruction of = 0;
wherein Q is the reactive output of the photovoltaic before reactive regulation, Delta Q is the step length for regulating the reactive output of the photovoltaic, and QcmdAnd the photovoltaic reactive power is output after reactive power regulation.
(g) If the voltage of the current sampling point of the photovoltaic grid-connected point is in the region (U)ldb+Uth，Uhdb-Uth) And the sampling point voltage is from the region [ U ]hdb，Uhlmt) When the photovoltaic power generation system is lowered to the region, the active power of the photovoltaic inverter is adjusted first, and the reactive power of the photovoltaic inverter is adjusted later, so that the active power output of the photovoltaic is increased, the line loss is reduced, and the specific method comprises the following steps:
calculating the value of P + delta P;
if P + delta P is less than or equal to Pmax(ii) a Then give P to the photovoltaic invertercmdInstruction of = P +. DELTA.p, and no longer adjusts for reactive power;
if P + delta P is greater than PmaxThen P is sent to the photovoltaic invertercmd=PmaxAnd readjusting reactive power;
if Q>Delta Q/2; then Q is sent to the photovoltaic invertercmdAn instruction of = Q- Δ Q;
if Q is less than-delta Q/2, Q is sent to the photovoltaic invertercmdAn instruction of = Q + Δq;
if-delta Q/2 is not less than Q and not more than delta Q/2, transmitting Q to the photovoltaic invertercmdInstruction of =0
Wherein P is the active output of the photovoltaic before active regulation, and DeltaP is the step length for regulating the active output of the photovoltaic, and PmaxIs the maximum limit value of the active output of the photovoltaic, PcmdFor active output of the photovoltaic after active regulation, Q for reactive output of the photovoltaic before reactive regulation, and DeltaQ for step length for regulating reactive output of the photovoltaic, QcmdAnd the photovoltaic reactive power output is realized after the reactive power regulation.
The invention has the advantages that: the invention adopts the method of firstly adjusting the reactive power and then changing the active power if the reactive power is adjusted to have little influence on the system voltage, thereby solving the problem that the adjustment objects with different access voltage grades are different and conforming to the current situation that the reactive power is more economical to adjust.
The invention adopts a voltage partition adjustment strategy to realize different adjustment means of different voltage areas; setting a voltage regulation holding interval to avoid frequent voltage regulation triggering; and an overvoltage and low-voltage locking interval is set, so that the situation that the voltage regulation control is triggered by mistake when the system fails is avoided, and the influence of the fault on the system is aggravated.
Drawings
Figure 1 is a flow chart of the present invention,
fig. 2 is a region division diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The method for regulating the voltage of the photovoltaic grid-connected point in the subareas comprises the following steps:
(1) setting a voltage constant, comprising: voltage upper limit adjusting threshold UhdbThreshold U for adjusting upper limit of locking voltagehlmtThreshold U for adjusting lower voltage limitldbLocking voltage lower limit adjusting threshold UllmtVoltage regulation return threshold Uth(ii) a The following magnitude relation is satisfied between the voltage fixed values: u shapellmt<Uldb<Uldb+Uth<Uhdb-Uth<Uhdb<Uhlmt。
(2) Dividing the regions according to the voltage constant value, comprising: (0, U)llmt]、（Ullmt，Uldb]、（Uldb，Uldb+Uth]、（Uldb+Uth，Uhdb-Uth）、[Uhdb-Uth，Uhdb）、[Uhdb，Uhlmt）、[Uhlmt, + ∞) as shown in fig. 2.
(3) Judging the area where the photovoltaic grid connection point voltage is located;
(4) according to the result of (3), the photovoltaic grid-connected point voltage is regulated in different areas, as shown in fig. 1, the specific method is as follows:
(a) if the voltage of the current sampling point of the photovoltaic grid-connected point is in the region of (0, U)llmt]If so, the voltage of the current sampling point is not adjusted;
(b) if the voltage of the current sampling point of the photovoltaic grid-connected point is in the region (U)llmt，Uldb]And increasing the reactive power of the photovoltaic inverter and not adjusting the active power of the photovoltaic inverter so as to increase the voltage of the current sampling point, wherein the specific method comprises the following steps:
calculating the value of Q + delta Q;
if Q + delta Q is less than or equal to QmaxThen send Q to the photovoltaic invertercmdAn instruction of = Q + Δq;
③ if Q +. DELTA.Q>QmaxThen Q is sent to the photovoltaic invertercmd=QmaxThe instructions of (a);
wherein Q is the reactive output of the photovoltaic before reactive regulation, Delta Q is the step length for regulating the reactive output of the photovoltaic, and QmaxMaximum limit value for the reactive output of photovoltaic, QcmdAnd the photovoltaic reactive power is output after reactive power regulation.
(c) If the voltage of the current sampling point of the photovoltaic grid-connected point is in the region (U)ldb，Uldb+Uth]If so, the voltage of the current sampling point is not adjusted;
(d) if the current sampling point voltage of the photovoltaic grid-connected point is in the region of [ U ]hlmt, + ∞), then the voltage at the current sampling point is not adjusted;
(e) if the area where the voltage of the current sampling point of the photovoltaic grid-connected point is located is [ U ]hdb，Uhlmt) Reducing the reactive power of the photovoltaic inverter firstly and then reducing the active power of the photovoltaic inverter so as to reduce the current sampling voltage, wherein the specific method comprises the following steps:
calculating the value of Q-delta Q;
② if Q-delta Q is more than or equal to Qmin(ii) a Then Q is sent to the photovoltaic invertercmdInstruction of = Q- Δ Q, and active is no longer regulated;
③ if Q-delta Q<QminThen Q is sent to the photovoltaic invertercmd=QminAnd then calculating the value of P- Δ P;
if P-delta P is greater than or equal to PminThen P is sent to the photovoltaic invertercmdAn instruction of = P- Δ P;
if P-DELTA P<PminThen give P to the photovoltaic invertercmd=PminThe instructions of (a);
wherein Q is the reactive output of the photovoltaic before reactive regulation, Delta Q is the step length for regulating the reactive output of the photovoltaic, and QminFor photovoltaic reactive output minimum limit, QcmdFor the reactive output of the photovoltaic after reactive regulation, P is the active output of the photovoltaic before active regulation, DeltaP is the step length for regulating the active output of the photovoltaic, PminIs the minimum limit value of active output, P, of the photovoltaiccmdThe photovoltaic active output after active regulation.
(f) If the voltage of the current sampling point of the photovoltaic grid-connected point is in the region (U)ldb+Uth，Uhdb-Uth) And sampling point voltage slave region (U)llmt，Uldb]When the voltage rises to the region, the reactive power of the photovoltaic inverter is adjusted, and the active power of the photovoltaic inverter is not adjusted, so that the line loss is reduced, and the specific method comprises the following steps:
if Q>Delta Q/2; then Q is sent to the photovoltaic invertercmdAn instruction of = Q- Δ Q;
if Q is less than-delta Q/2, Q is sent to the photovoltaic invertercmdAn instruction of = Q + Δq;
thirdly, if-delta Q/2 is not less than Q and not more than delta Q/2, Q is sent to the photovoltaic invertercmdAn instruction of = 0;
wherein Q is the reactive output of the photovoltaic before reactive regulation, Delta Q is the step length for regulating the reactive output of the photovoltaic, and QcmdAnd the photovoltaic reactive power is output after reactive power regulation.
(g) If the voltage of the current sampling point of the photovoltaic grid-connected point is in the region (U)ldb+Uth，Uhdb-Uth) And the sampling point voltage is from the region [ U ]hdb，Uhlmt) When the photovoltaic power generation system is lowered to the region, the active power of the photovoltaic inverter is adjusted first, and the reactive power of the photovoltaic inverter is adjusted later, so that the active power output of the photovoltaic is increased, the line loss is reduced, and the specific method comprises the following steps:
calculating the value of P + delta P;
if P + delta P is less than or equal to Pmax(ii) a Then give P to the photovoltaic invertercmdInstruction of = P +. DELTA.P, and reactive power is no longer regulated;
if P + delta P is greater than PmaxThen give P to the photovoltaic invertercmd=PmaxAnd readjusting reactive power;
if Q>Delta Q/2; then Q is sent to the photovoltaic invertercmdAn instruction of = Q- Δ Q;
if Q is less than-delta Q/2, Q is sent to the photovoltaic invertercmdAn instruction of = Q + Δq;
if-delta Q/2 is not less than Q and not more than delta Q/2, transmitting Q to the photovoltaic invertercmdAn instruction of = 0;
wherein P is the active output of the photovoltaic before active regulation, and DeltaP is the step length for regulating the active output of the photovoltaic, and PmaxIs the maximum limit value of the active output of the photovoltaic, PcmdFor active output of the photovoltaic after active regulation, Q for reactive output of the photovoltaic before reactive regulation, and DeltaQ for step length for regulating reactive output of the photovoltaic, QcmdAnd the photovoltaic reactive power is output after reactive power regulation.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (1)
1. A method for regulating the voltage of a photovoltaic grid-connected point in different areas is characterized by comprising the following steps:
(1) setting a voltage fixed value, wherein the voltage fixed value comprises: voltage upper limit adjusting threshold UhdbThreshold U for adjusting upper limit of locking voltagehlmtThreshold U for adjusting lower voltage limitldbThreshold U for adjusting lower limit of locking voltagellmtVoltage regulation return threshold Uth(ii) a The voltage fixed values satisfy the following size relation: u shapellmt<Uldb<Uldb+Uth<Uhdb-Uth<Uhdb<Uhlmt ；
(2) Dividing the region according to the voltage fixed value, wherein the region comprises: (0, U)llmt]、（Ullmt，Uldb]、（Uldb，Uldb+Uth]、（Uldb+Uth，Uhdb-Uth）、[Uhdb-Uth，Uhdb）、[Uhdb，Uhlmt）、[Uhlmt，+∞）；
(3) Judging the area where the photovoltaic grid connection point voltage is located;
(4) according to the result of (3), the photovoltaic grid-connected point voltage is regulated in different areas, and the specific method comprises the following steps:
(a) if the voltage of the current sampling point of the photovoltaic grid-connected point is in the area of (0, U)llmt]If so, the voltage of the current sampling point is not adjusted;
(b) if the voltage of the current sampling point of the photovoltaic grid-connected point is in the region (U)llmt，Uldb]And increasing the reactive power of the photovoltaic inverter and not adjusting the active power of the photovoltaic inverter so as to increase the voltage of the current sampling point, wherein the specific method comprises the following steps:
calculating the value of Q + delta Q;
if Q + delta Q is less than or equal to QmaxThen Q is sent to the photovoltaic invertercmdAn instruction of = Q + Δq;
③ if Q +. DELTA.Q> QmaxThen send Q to the photovoltaic invertercmd= QmaxThe instructions of (1);
wherein Q is the reactive output of the photovoltaic before reactive regulation, Delta Q is the step length for regulating the reactive output of the photovoltaic, and QmaxMaximum limit value for the reactive output of photovoltaic, QcmdThe photovoltaic output is the reactive output of the photovoltaic after reactive adjustment;
(c) if the voltage of the current sampling point of the photovoltaic grid-connected point is in the region (U)ldb，Uldb+Uth]If so, the voltage of the current sampling point is not adjusted;
(d) if the current sampling point voltage of the photovoltaic grid-connected point is in the region of [ U ]hlmt, + ∞), then the voltage at the current sampling point is not adjusted;
(e) if the current sampling point voltage of the photovoltaic grid-connected point is in the region of [ U ]hdb，Uhlmt) Reducing the reactive power of the photovoltaic inverter firstly and then reducing the active power of the photovoltaic inverter so as to reduce the voltage of the current sampling point, wherein the specific method comprises the following steps:
calculating the value of Q-delta Q;
② if Q-delta Q is more than or equal to Qmin(ii) a Then Q is sent to the photovoltaic invertercmdInstruction of = Q- Δ Q, and no longer adjusts for real power;
③ if Q-delta Q<QminThen Q is sent to the photovoltaic invertercmd=QminAnd then calculating the value of P- Δ P;
if P-delta P is greater than or equal to PminThen P is sent to the photovoltaic invertercmdAn instruction of = P- Δ P;
if P-DELTA P<PminThen P is sent to the photovoltaic invertercmd=PminThe instructions of (a);
wherein Q is the reactive output of the photovoltaic before reactive regulation, Delta Q is the step length for regulating the reactive output of the photovoltaic, and QminFor photovoltaic reactive output minimum limit, QcmdFor the reactive output of the photovoltaic after reactive regulation, P is the active output of the photovoltaic before active regulation, DeltaP is the step length for regulating the active output of the photovoltaic, PminIs the minimum limit value of active output, P, of the photovoltaiccmdThe photovoltaic active output is the photovoltaic active output after active regulation;
(f) if the voltage of the current sampling point of the photovoltaic grid-connected point is in the region (U)ldb+Uth，Uhdb-Uth) And sampling point voltage slave region (U)llmt，Uldb]Is raised to (U)ldb+Uth，Uhdb-Uth) If the reactive power of the photovoltaic inverter is adjusted, the active power of the photovoltaic inverter is not adjusted, so that the line loss is reduced, and the specific method comprises the following steps:
if Q>Delta Q/2; then Q is sent to the photovoltaic invertercmdAn instruction of = Q- Δ Q;
if Q is less than-delta Q/2, Q is sent to the photovoltaic invertercmdAn instruction of = Q + Δq;
thirdly, if-delta Q/2 is not less than Q and not more than delta Q/2, Q is sent to the photovoltaic invertercmdAn instruction of = 0;
wherein Q is the reactive output of the photovoltaic before reactive regulation, Delta Q is the step length for regulating the reactive output of the photovoltaic, and QcmdThe photovoltaic output is the reactive output of the photovoltaic after reactive adjustment;
(g) if the voltage of the current sampling point of the photovoltaic grid-connected point is in the region (U)ldb+Uth，Uhdb-Uth) And the sampling point voltage is in the following region [ U ]hdb，Uhlmt) When the photovoltaic power generation system is lowered to the region, the active power of the photovoltaic inverter is adjusted first, and the reactive power of the photovoltaic inverter is adjusted later, so that the active power output of the photovoltaic is increased, the line loss is reduced, and the specific method comprises the following steps:
calculating the value of P + delta P;
if P + delta P is less than or equal to Pmax(ii) a Then give P to the photovoltaic invertercmdInstruction of = P +. DELTA.p, and no longer adjusts for reactive power;
if P + delta P is greater than PmaxThen P is sent to the photovoltaic invertercmd=PmaxAnd readjusting reactive power;
if Q>Delta Q/2; then Q is sent to the photovoltaic invertercmdAn instruction of = Q- Δ Q;
if Q is less than-delta Q/2, Q is sent to the photovoltaic invertercmdInstructions for Q +. DELTA.Q;
if-delta Q/2 is not less than Q and not more than delta Q/2, transmitting Q to the photovoltaic invertercmdAn instruction of = 0;
wherein P is the active output of the photovoltaic before active regulation, and DeltaP is the step length for regulating the active output of the photovoltaic, and PmaxIs the maximum limit value of the active output of the photovoltaic, PcmdFor active output of the photovoltaic after active regulation, Q for reactive output of the photovoltaic before reactive regulation, and DeltaQ for step length for regulating reactive output of the photovoltaic, QcmdAnd the photovoltaic reactive power is output after reactive power regulation.
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| JP2013027089A (en) * | 2011-07-19 | 2013-02-04 | Mitsubishi Electric Corp | Voltage control apparatus |
| CN103825299A (en) * | 2014-02-28 | 2014-05-28 | 深圳市长昊机电有限公司 | Grid-connected photovoltaic power generation system and control method thereof |
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| CN107658909A (en) * | 2017-09-26 | 2018-02-02 | 湖南大学 | A kind of low and medium voltage distribution network voltage lifting suppressing method of the access containing photovoltaic |
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