CN113725866A - Control method for distributed power supply of power distribution network - Google Patents
Control method for distributed power supply of power distribution network Download PDFInfo
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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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- 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
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The embodiment of the invention discloses a control method of a distributed power supply of a power distribution network. The method comprises the following steps: acquiring voltage values, active values and reactive values of a plurality of distributed power generating units of a power distribution network; taking any distributed power supply unit as a target control unit, and calculating a reactive power regulation value of the target control unit and/or a non-target control unit according to a voltage value, an active value and an inactive value of the target control unit; and performing ascending adjustment or descending adjustment on the reactive value of the target control unit and/or the non-target control unit according to the reactive adjustment value so as to stabilize the output voltage of the target control unit. According to the embodiment of the invention, the voltage stability control in the distributed power supply of the power distribution network is realized by controlling the reactive value in the distributed power supply of the power distribution network.
Description
Technical Field
The embodiment of the invention relates to an electrical control technology, in particular to a control method of a distributed power supply of a power distribution network.
Background
After the distributed power supply is connected to the power distribution network, the characteristic of unidirectional energy circulation of the traditional power distribution network is changed, and the reactive voltage characteristic is changed remarkably in a steady state or a transient state. At a steady-state level, the high-permeability access of the distributed power supply can affect the overall reactive voltage characteristic of the power distribution network, and the influence degree is related to the output, the access position, the access mode and the power factor of the distributed power supply. On the transient level, the node voltage fluctuation is often caused by the start-up and shut-down or output change of the distributed power supply.
With the large-scale integration of distributed power sources into power distribution networks, how to keep voltage running smoothly when active power changes is a key problem to be solved in the field.
Disclosure of Invention
The embodiment of the invention provides a control method for a distributed power supply of a power distribution network, which is used for realizing voltage stability control in the power distribution network of the distributed power supply.
The embodiment of the invention provides a control method of a distributed power supply of a power distribution network. Wherein, the method comprises the following steps:
acquiring voltage values, active values and reactive values of a plurality of distributed power generating units of a power distribution network;
taking any distributed power supply unit as a target control unit, and calculating a reactive power regulation value of the target control unit and/or a non-target control unit according to a voltage value, an active value and an inactive value of the target control unit;
and performing ascending adjustment or descending adjustment on the reactive value of the target control unit and/or the non-target control unit according to the reactive adjustment value so as to stabilize the output voltage of the target control unit.
The embodiment of the invention provides a control method of a distributed power supply of a power distribution network, which solves the problem that the voltage of the distributed power supply is out of limit after the distributed power supply is merged into the power distribution network in a large scale by controlling the reactive value in the distributed power supply of the power distribution network, and realizes the voltage stability control in the distributed power supply of the power distribution network.
Drawings
Fig. 1 is a flowchart of a method for controlling a distributed power supply of a power distribution network according to an embodiment of the present invention;
fig. 2 is a flowchart of a voltage prevention control operation in a control method of a distributed power supply of a power distribution network according to a second embodiment of the present invention;
fig. 3 is a flowchart of voltage correction control operation in a control method for a distributed power supply of a power distribution network according to a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a control method for a distributed power supply of a power distribution network according to an embodiment of the present invention, where the embodiment is applicable to a situation that an output voltage of the distributed power supply exceeds a limit, the method specifically includes:
s110, acquiring voltage values, active values and reactive values of a plurality of distributed power generating units of the power distribution network;
the distributed power supply unit consists of a plurality of independent power supplies which have the power of thousands of watts to dozens of megawatts, are small and are independently compatible with the environment. In the above operation, specifically, the voltage value, the active value and the passive value of the distributed power supply unit are measured by related instruments.
S120, taking any distributed power supply unit as a target control unit, and calculating a reactive power regulation value of the target control unit and/or a non-target control unit according to a voltage value, an active value and an inactive value of the target control unit;
in the above operation, specifically, in the voltage prevention control process, the reactive power adjustment value may be calculated according to a voltage value, an active value and a reactive value of the target control unit at a current time and a next time; in the voltage correction control process, the reactive power adjustment value may be calculated according to the voltage value, the active value, and the reactive value of the target control unit at the current time.
And S130, performing ascending adjustment or descending adjustment on the reactive value of the target control unit and/or the non-target control unit according to the reactive adjustment value so as to stabilize the output voltage of the target control unit.
The reactive adjustment value may include a reactive up-regulation value or a reactive down-regulation value. In the above operation, specifically, if the reactive value of the target control unit is adjusted by the reactive adjustment value and exceeds the upper and lower reactive limit ranges of the target control unit, the auxiliary reactive adjustment value of the non-target control unit is determined.
According to the technical scheme of the embodiment of the invention, the out-of-limit condition of the output voltage of the distributed power supply caused by active change is adjusted by calculating the reactive value of the distributed power supply, so that the effect of stable transition of the output voltage is achieved in the whole active change process.
Example two
Fig. 2 is a flowchart of a voltage prevention control operation in a control method for a distributed power supply of a power distribution network according to a second embodiment of the present invention. Wherein, when a voltage regulation period comes, if 2T is more than or equal to Ta+1-taAnd if the voltage value is more than or equal to T, performing a voltage prevention control process, and calculating a reactive power adjustment value of the target control unit according to the voltage value, the active value and the reactive value of the target control unit. The method specifically comprises the following steps:
in the current voltage regulation period, acquiring the target control unit G [ i ]]The planned active value P of the next moment in timea+1[i](ii) a Wherein, P represents the active value, subscript a and a +1 represent the time sequence number, and i represents the unit sequence number;
s210, if (U)a[i]+（Pa+1[i]-Pa[i]）×S p [i]）≥Umax[i]Calculating the reactive power reduction regulating quantity Q of the target control unit according to the following formula (2) δ_down [i]And then the process goes to the descending adjustment process;
Q δ_down [i]=（（Ua[i]+（Pa+1[i]-Pa[i]）×S p [i]）- Umax[i]）/ S q [i] （2）
s220, if (U)a[i]+（Pa+1[i]-Pa[i]）×S p [i]）≤Umin[i]Calculating the reactive power rise regulating quantity Q of the target control unit according to the following formula (3) δ_up [i]And then the process goes to the ascending adjustment process;
Q δ_up [i]=（Umin[i]-（Ua[i]+（Pa+1[i]-Pa[i]）×S p [i]））/ S q [i] （3）
wherein, UaRepresenting the voltage value, S, at the present moment q Sensitivity of the voltage at the representative machine to reactive changes, UmaxUpper limit value, U, of the electric voltage at the machine endminThe lower limit value of the electric terminal is represented.
S230, if Umax[i]≥（Ua[i]+（Pa+1[i]-Pa[i]）×S p [i]）≥Umin[i]Ending the current voltage regulation period;
the reactive power adjustment value performs descending adjustment on the reactive power value of the target control unit and/or the non-target control unit, and comprises the following steps:
s211, if (Q)a[i]- Q δ_down [i]）≥Qmin[i]Then calculate the target control unit G [ i ]]Reactive power set value Q of set [i]= Qa[i]- Q δ_down [i]And setting the reactive power value Q set [i]Issuing the data to a target control unit to execute reactive power regulation;
s212, if (Q)a[i]-Q δ_down [i]）<Qmin[i]Then set up the target control unit G [ i ]]Has a reactive set value of Q set [i]= Qmin[i](ii) a And calculates the total reactive power regulating quantity Q needing the assistance of other units according to the following formula (6) set_down [i]：
Q set_down [i]= Qmin[i]-（Qa[i]-Q δ_down [i]） （6）
Other units G [ j ]]According to reactive margin M [ j ]]The reactive power margins of the sorted units are recorded as M after being arranged from large to small down [n]，n=1，…，N；M down [n]≥M down [n+1]N =1, …, N-1; wherein, the reactive margin M [ j]=（Q[j]-Q min [j]）/（Q max [j]- Q min [j]）；
According to the formula (7), the equivalent quantity Q is adjusted and accumulated by calculating the equal reactive margin one by one align [m]，m=1，…，N-1：
When Q is align [m]≥Q δ_down [i]Then, the reactive margin M of M other units is calculated according to the following formula (8) set 
：
Setting the reactive power Q of m other units set [n]Calculated according to the following equation (9):
Q set [n]=（Q max [n] – Q min [n]）× M set [i]+ Q min [n] （9）
setting the reactive power value Q of each unit set Issuing the data to each unit to execute reactive power regulation;
wherein Q isaRepresenting the reactive value, Q, of the current timeminRepresenting a reactive regulation lower limit value, QmaxRepresenting the reactive power regulation upper limit value.
If m = N-1, and Q align [m] < Q δ_down [i]Then m = N is set and the calculation of the reactive power set value Q of the N other units according to equations (8) and (9) is returned set Setting the idle work of each unit to be Q set And issuing the data to each unit to execute reactive power regulation.
The reactive power adjustment value is used for adjusting the reactive power value of the target control unit and/or the reactive power value of the non-target control unit in an ascending mode, and the reactive power adjustment value comprises the following steps:
s221, if (Q) a [i]+ Q δ_up [i]）≤Q max [i]Then, the target control unit G [ i ] is calculated]Reactive power set value Q of set [i]= Q a [i]+ Q δ_up [i]And setting the reactive power value Q set [i]Issuing the data to a target control unit to execute reactive power regulation;
s222, if (Q) a [i]+ Q δ_up [i]）>Q max [i]Then set up the target control unit G [ i ]]Has a reactive set value of Q set [i]= Qmax[i](ii) a And calculating the total reactive power regulating quantity Q needing the assistance of other units according to the following formula (10) set_up [i]：
Q set_up [i] =（Q a [i]+ Q δ_up [i]）-Q max [i] （10）
Other units G [ j ]]According to reactive margin M [ j]The reactive power margins of the sorted groups are recorded as M after being arranged from small to large up [n]，n=1，…，N；M up [n]≤M up [n+1]N =1, …, N-1; wherein N is the number of power units performing reactive power regulation, I is the total number of power units, and reactive power margin M [ j [ ]]=（Q[j]-Q min [j]）/（Q max [j]- Q min [j]）；
According to the formula (11), the equivalent reactive margin adjustment accumulated quantity Q is calculated one by one align [m]，m=1，…，N-1：
When Q is align [m]≥Q δ_up [i]Then, the reactive margin M of M other units is calculated according to the following formula (12) set [i]：
Setting the reactive power Q of m other units set [n]Calculated according to the following equation (13):
Q set [n]=（Q max [n] – Q min [n]）× M set [i]+ Q min [n] （13）
setting the reactive power value Q of each unit set Issuing the data to each unit to execute reactive power regulation;
if m = N-1, and Q align [m] < Q δ_up [i]Then m = N is set and the calculation of the reactive power set value Q of m other units according to equations (12) and (13) is returned set Setting the idle work of each unit to be Q set And issuing the data to each unit to execute reactive power regulation.
According to the technical scheme of the embodiment of the invention, the reactive value of the target control unit and/or the non-target control unit is/are adjusted to be decreased or increased through voltage prevention control, so that the problem of voltage out-of-limit possibly caused by executing the active planned value is solved, and the effect of voltage smooth transition is realized.
EXAMPLE III
Fig. 3 is a flowchart of a voltage correction control operation in a control method for a distributed power supply of a power distribution network according to a third embodiment of the present invention. Wherein, when a voltage regulation period comes, if ta+1-ta<T or Ta+1-ta>And 2T, performing a voltage correction control process, and calculating a reactive power adjustment value of the target control unit according to the voltage value, the active value and the passive value of the target control unit. The method specifically comprises the following steps:
s310, if Ua[i]≥Umax[i]Calculating the reactive power reduction regulating quantity Q of the target control unit according to the following formula (4) δ_down [i]And then the process goes to the descending adjustment process;
Q δ_down [i]=（Ua[i]-Umax[i]）/ S q [i] （4）
s320, if Ua[i]≤Umin[i]Calculating the reactive power rise regulating quantity Q of the target control unit according to the following formula (5) δ_up [i]And then the process goes to the ascending adjustment process;
Q δ_up [i]=（Umin[i]- Ua[i]）/ S q [i] （5）
wherein, UaRepresenting the voltage value, S, at the present moment q Sensitivity of the voltage at the representative machine to reactive changes, UmaxUpper limit value, U, of the electric voltage at the machine endminThe lower limit value of the electric terminal is represented.
S330, if Umax[i]≥Ua[i]≥Umin[i]Determining to end the current voltage regulation period;
the reactive power adjustment value performs descending adjustment on the reactive power value of the target control unit and/or the non-target control unit, and comprises the following steps:
s311, if (Q)a[i]- Q δ_down [i]）≥Qmin[i]Then calculate the target control unit G [ i ]]Reactive power set value Q of set [i]= Qa[i]- Q δ_down [i]And setting the reactive power value Q set [i]Issuing the data to a target control unit to execute reactive power regulation;
s312, if (Q)a[i]- Q δ_down [i]）<Qmin[i]Then set up the target control unit G [ i ]]Has a reactive set value of Q set [i]= Qmin[i](ii) a And calculates the total reactive power regulating quantity Q needing the assistance of other units according to the following formula (6) set_down [i]：
Q set_down [i]= Qmin[i]-（Qa[i]- Q δ_down [i]） （6）
Other units G [ j ]]According to reactive margin M [ j ]]The reactive power margins of the sorted units are recorded as M after being arranged from large to small down [n]，n=1，…，N，N=I-1；M down [n]≥M down [n+1]N =1, …, N-1; wherein N is the number of power units performing reactive power regulation, I is the total number of power units, and reactive power margin M [ j [ ]]=（Q[j]-Q min [j]）/（Q max [j]- Q min [j]）；
The equal power margins are calculated one by one according to the formula (7)Degree adjustment accumulation equivalent quantity Q align [m]，m=1，…，N-1；
When Q is align [m]≥Q δ_down [i]Then, the reactive margin M of M other units is calculated according to the following formula (8) set [i]：
Setting the reactive power Q of m other units set [n]Calculated according to the following equation (9):
Q set [n]=（Q max [n] – Q min [n]）× M set [i]+ Q min [n] （9）
setting the reactive power value Q of each unit set Issuing the data to each unit to execute reactive power regulation;
if m = N-1, and Q align [m] < Q δ_down [i]Then m = N is set and the calculation of the reactive power set value Q of the N other units according to equations (8) and (9) is returned set Setting the idle work of each unit to be Q set And issuing the data to each unit to execute reactive power regulation.
The reactive power adjustment value is used for adjusting the reactive power value of the target control unit and/or the reactive power value of the non-target control unit in an ascending mode, and the reactive power adjustment value comprises the following steps:
s321, if (Q) a [i]+ Q δ_up [i]）≤Q max [i]Then, the target control unit G [ i ] is calculated]Reactive power set value Q of set [i]= Q a [i]+ Q δ_up [i]And setting the reactive power value Q set [i]Issuing the data to a target control unit to execute reactive power regulation;
s322, if (Q) a [i]+ Q δ_up [i]）>Q max [i]Then set up the target control unit G [ i ]]Has a reactive set value of Q set [i]= Qmax[i](ii) a And calculating the total reactive power regulating quantity Q needing the assistance of other units according to the following formula (10) set_up [i]：
Q set_up [i] =（Q a [i]+ Q δ_up [i]-Q max [i] （10）
Other units G [ j ]]According to reactive margin M [ j]The reactive power margins of the sorted groups are recorded as M after being arranged from small to large up [n]，n=1，…，N，N=I-1；M up [n]≤M up [n+1]N =1, …, N-1; wherein, the reactive margin M [ j]=（Q[j]-Q min [j]）/（Q max [j]- Q min [j]）；
According to the formula (11), the equivalent reactive margin adjustment accumulated quantity Q is calculated one by one align [m]，m=1，…，N-1：
When Q is align [m]≥Q δ_up [i]Then, the reactive margin M of M other units is calculated according to the following formula (12) set [i]：
Setting the reactive power Q of m other units set [n]Calculated according to the following equation (13):
Q set [n]=（Q max [n] – Q min [n]）× M set [i]+ Q min [n] （13）
setting the reactive power value Q of each unit set Issuing the data to each unit to execute reactive power regulation;
if m = N-1, and Q align [m] < Q δ_up [i]Then m = N is set and returnCalculating reactive power set values Q of m other units according to formulas (12) and (13) set Setting the idle work of each unit to be Q set And issuing the data to each unit to execute reactive power regulation.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (7)
1. A control method for a distributed power supply of a power distribution network is characterized by comprising the following steps:
acquiring voltage values, active values and reactive values of a plurality of distributed power generating units of a power distribution network;
taking any distributed power supply unit as a target control unit, and calculating a reactive power regulation value of the target control unit and/or a non-target control unit according to a voltage value, an active value and an inactive value of the target control unit;
according to the reactive adjustment value, performing ascending adjustment or descending adjustment on the reactive value of the target control unit and/or the non-target control unit to stabilize the output voltage of the target control unit;
wherein the calculating a reactive power adjustment value of the target control unit according to the voltage value, the active value and the passive value of the target control unit comprises:
in the voltage prevention control process, calculating a reactive power adjustment value of the target control unit according to the voltage value, the active value and the passive value of the target control unit at the current moment and the next moment;
in the voltage correction control process, a reactive power adjustment value of the target control unit is calculated according to the voltage value, the active value and the passive value of the target control unit at the current moment.
2. The method of claim 1, wherein calculating the reactive power adjustment value of the target control unit according to the voltage value, the active value and the passive value of the target control unit comprises:
and if the reactive value of the target control unit exceeds the upper and lower reactive limit ranges of the target control unit after being adjusted by the reactive adjustment value, determining an auxiliary reactive adjustment value of the non-target control unit.
3. The method of claim 1, wherein the reactive adjustment value comprises a reactive up-regulation value or a reactive down-regulation value.
4. The method according to claim 1, wherein in the voltage prevention control process, calculating the reactive power adjustment value of the target control unit according to the voltage value, the active value and the passive value of the target control unit at the current time includes:
in the current voltage regulation period, acquiring the target control unit G [ i ]]The planned active value P of the next moment in timea+1[i](ii) a Wherein, P represents the active value, subscript a and a +1 represent the time sequence number, and i represents the unit sequence number;
if (U)a[i]+（Pa+1[i]-Pa[i]）×S p [i]）≥Umax[i]Calculating the reactive power reduction regulating quantity Q of the target control unit according to the following formula (2) δ_down [i]And then the process goes to the descending adjustment process;
Q δ_down [i]=（（Ua[i]+（Pa+1[i]-Pa[i]）×S p [i]）- Umax[i]）/ S q [i] （2）
if (U)a[i]+（Pa+1[i]-Pa[i]）×S p [i]）≤Umin[i]Then, said is calculated according to the following formula (3)Reactive power rising regulating quantity Q of target control unit δ_up [i]And then the process goes to the ascending adjustment process;
Q δ_up [i]=（Umin[i]-（Ua[i]+（Pa+1[i]-Pa[i]）×S p [i]））/ S q [i] （3）
if U ismax[i]≥（Ua[i]+（Pa+1[i]-Pa[i]）×S p [i]）≥Umin[i]Ending the current voltage regulation period;
wherein, UaRepresenting the voltage value, S, at the present moment p Sensitivity of the representative machine terminal voltage to active variations, UmaxUpper limit value, U, of the electric voltage at the machine endminThe lower limit value of the electric terminal is represented.
5. The method according to claim 4, wherein in the voltage correction control process, calculating the reactive power adjustment value of the target control unit according to the voltage value, the active value and the passive value of the target control unit at the current time comprises:
in the current voltage regulation period of the voltage regulator,
if U isa[i]≥Umax[i]Calculating the reactive power reduction regulating quantity Q of the target control unit according to the following formula (4) δ_down [i]And then the process goes to the descending adjustment process;
Q δ_down [i]=（Ua[i]-Umax[i]）/ S q [i] （4）
if U isa[i]≤Umin[i]Calculating the reactive power rise regulating quantity Q of the target control unit according to the following formula (5) δ_up [i]And then the process goes to the ascending adjustment process;
Q δ_up [i]=（Umin[i]- Ua[i]）/ S q [i] （5）
if U ismax[i]≥Ua[i]≥Umin[i]Determining to end the current voltage regulation period;
wherein, UaRepresenting the voltage value, S, at the present moment q Sensitivity of the voltage at the representative machine to reactive changes, UmaxUpper limit value, U, of the electric voltage at the machine endminThe lower limit value of the electric terminal is represented.
6. The method according to claim 4 or 5, wherein performing a droop adjustment on the reactive value of the target control unit and/or the non-target control unit according to the reactive adjustment value comprises:
if (Q)a[i]- Q δ_down [i]）≥Qmin[i]Then calculate the target control unit G [ i ]]Reactive power set value Q of set [i]= Qa[i]- Q δ_down [i]And setting the reactive power value Q set [i]Issuing the data to a target control unit to execute reactive power regulation;
if (Q)a[i]-Q δ_down [i]）<Qmin[i]Then set up the target control unit G [ i ]]Has a reactive set value of Q set [i]= Qmin[i](ii) a And calculates the total reactive power regulating quantity Q needing the assistance of other units according to the following formula (6) set_down [i]：
Q set_down [i]= Qmin[i]-（Qa[i]-Q δ_down [i]） （6）
Other units G [ j ]]According to reactive margin M [ j ]]The reactive power margins of the sorted units are recorded as M after being arranged from large to small down [n]，n=1，…，N，N=I-1；M down [n]≥M down [n+1]N =1, …, N-1; wherein N is the number of power units performing reactive power regulation, I is the total number of power units, and reactive power margin M [ j [ ]]=（Q[j]-Q min [j]）/（Q max [j]- Q min [j]）；
According to the formula (7), the equivalent reactive margin adjustment accumulated quantity Q is calculated one by one align [m]，m=1，…，N-1；
When Q is align [m]≥Q δ_down [i]Then, the reactive margin M of M other units is calculated according to the following formula (8) set 
：
Setting the reactive power Q of m other units set [n]Calculated according to the following equation (9):
Q set [n]=（Q max [n] – Q min [n]）× M set [i] + Q min [n] （9）
wherein Q isaRepresenting the reactive value, Q, of the current timeminRepresenting a reactive regulation lower limit value, QmaxRepresenting a reactive power regulation upper limit value;
setting the reactive power value Q of each unit set Issuing the data to each unit to execute reactive power regulation;
if m = N-1, and Q align [m] < Q δ_down [i]Then m = N is set and the calculation of the reactive power set value Q of the N other units according to equations (8) and (9) is returned set Setting the idle work of each unit to be Q set Issuing the data to each unit to execute reactive power regulation;
wherein Q isaRepresenting the reactive value, Q, of the current timeminRepresenting a reactive regulation lower limit value, QmaxRepresenting the reactive power regulation upper limit value.
7. The method according to claim 4 or 5, wherein the up-regulation of the reactive power value of the target control unit and/or the non-target control unit according to the reactive power regulation value comprises:
if (Q) a [i]+ Q δ_up [i]）≤Q max [i]Then, the target control unit G [ i ] is calculated]Reactive power set value Q of set [i]= Q a [i]+ Q δ_up [i]And setting the reactive power value Q set [i]Issuing the data to a target control unit to execute reactive power regulation;
if (Q) a [i]+ Q δ_up [i]）>Q max [i]Then set up the target control unit G [ i ]]Has a reactive set value of Q set [i]= Qmax[i](ii) a And calculating the total reactive power regulating quantity Q needing the assistance of other units according to the following formula (10) set_up [i]：
Q set_up [i] =（Q a [i]+ Q δ_up [i]）-Q max [i] （10）
Other units G [ j ]]According to reactive margin M [ j]The reactive power margins of the sorted groups are recorded as M after being arranged from small to large up [n]，n=1，…，N，N=I-1；M up [n]≤M up [n+1]N =1, …, N-1; wherein N is the number of power units performing reactive power regulation, I is the total number of power units, and reactive power margin M [ j [ ]]=（Q[j]-Q min [j]）/（Q max [j]- Q min [j]）；
According to the formula (11), the equivalent reactive margin adjustment accumulated quantity Q is calculated one by one align [m]，m=1，…，N-1：
When Q is align [m]≥Q δ_up [i]Then, the reactive margin M of M other units is calculated according to the following formula (12) set [i]：
M of itReactive set value Q of other units set [n]Calculated according to the following equation (13):
Q set [n]=（Q max [n] – Q min [n]）× M set [i]+ Q min [n] （13）
wherein Q isaRepresenting the reactive value, Q, of the current timeminRepresenting a reactive regulation lower limit value, QmaxRepresenting a reactive power regulation upper limit value;
setting the reactive power value Q of each unit set Issuing the data to each unit to execute reactive power regulation;
if m = N-1, and Q align [m] < Q δ_up [i]Then m = N is set and the calculation of the reactive power set value Q of m other units according to equations (12) and (13) is returned set Setting the idle work of each unit to be Q set And issuing the data to each unit to execute reactive power regulation.
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