CN112636377B - Method and system for solving dynamic reactive power demand of receiving-end direct current converter station - Google Patents

Method and system for solving dynamic reactive power demand of receiving-end direct current converter station Download PDF

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CN112636377B
CN112636377B CN202011395850.8A CN202011395850A CN112636377B CN 112636377 B CN112636377 B CN 112636377B CN 202011395850 A CN202011395850 A CN 202011395850A CN 112636377 B CN112636377 B CN 112636377B
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direct current
voltage
fault
converter station
point
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CN112636377A (en
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徐晓春
戴欣
陈建华
王栋
颜长鑫
陈天华
戴则梅
闪鑫
王毅
杜磊
徐陆飞
熊正勇
徐柳飞
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State Grid Corp of China SGCC
Nari Technology Co Ltd
State Grid Electric Power Research Institute
HuaiAn Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
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State Grid Corp of China SGCC
Nari Technology Co Ltd
State Grid Electric Power Research Institute
HuaiAn Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
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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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention relates to the technical field of power system operation and control, and discloses a method and a system for solving a dynamic reactive power requirement of a receiving end direct current converter station, wherein the voltage variation of a receiving end direct current floor point after direct current fault blocking is calculated through traditional N-1 fault scanning, and the total recovery time of the direct current floor point voltage is calculated according to parameters such as the capacitor capacity, the number, protection cutting time setting, the direct current floor point node voltage upper limit requirement and the like of the receiving end direct current converter station; and comparing the total voltage recovery time of the direct current grounding point with the voltage recovery time demand to calculate the dynamic reactive power demand of the direct current convertor station. Compared with the prior art, the safety analysis of the receiving end voltage is carried out by considering the voltage recovery capability of the receiving end direct current converter station after the fault, the damage of the potential direct current fault to a receiving end power grid is reduced, and the safety analysis method is simple in calculation, strong in applicability and capable of having the inevitable convergence characteristic based on the power grid parameters and demand indexes which are convenient to collect.

Description

Method and system for solving dynamic reactive power demand of receiving-end direct current converter station
Technical Field
The invention relates to the technical field of operation and control of power systems, in particular to a method and a system for solving a dynamic reactive power requirement of a receiving-end direct current converter station.
Background
The current situation of power with unbalanced energy and load distribution can be greatly relieved by the extra-high voltage direct current, and the reactive power demand of the direct current is only compensated near a sending end direct current outgoing point and a receiving end direct current grounding point because the direct current only transmits active power. For the receiving end, a large amount of reactive compensation supporting direct current power large-scale transmission can be carried out on the capacitor in the direct current converter station. When a single-pole or double-pole blocking fault occurs in direct current, the voltage of a receiving end direct current grounding point rises suddenly, the protection of a filter capacitor is triggered and the filtering capacitor is cut off in turns, if the voltage near the direct current grounding point is too high or the duration time is too long, the protection action of a power grid is easily caused, the power grid accident is caused, and great threat and challenge are brought to the safe operation of the power grid.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method and a system for solving the dynamic reactive power demand of a receiving end direct current converter station.
The invention provides a method for solving dynamic reactive power requirements of a receiving end direct current converter station, which comprises the following steps:
step 1: calculating the voltage change quantity of a receiving end direct current grounding point after the direct current fault is blocked through traditional N-1 fault scanning, and calculating the total voltage recovery time of the direct current grounding point according to the parameters such as the capacity and the quantity of capacitors of a receiving end direct current converter station, protection cut-off time setting, the voltage upper limit requirement of a direct current grounding point node and the like;
step 2: and comparing the total voltage recovery time of the direct current grounding point with the voltage recovery time demand to calculate the dynamic reactive power demand of the direct current convertor station.
Further, the total recovery time of the voltage of the dc ground point in step 1 is as follows:
Figure BDA0002815089470000011
wherein j is 1,2,3 …, and m is the cut capacitor bank number; t is t c,j Setting a time length for cutting off the protection of the jth group of capacitors; s c,j And Q c,j The node voltage sensitivity and the capacity of the jth group of capacitors to a fault point are respectively, and the product of the node voltage sensitivity and the capacity is the voltage variation of a grounding point of the cut-off capacitor; v p And
Figure BDA0002815089470000012
the direct current blocking front voltage and the fault rear node voltage upper limit requirement of a receiving end direct current grounding point are respectively met;
Figure BDA0002815089470000021
the voltage variation of the receiving end direct current landing point after the direct current fault.
Further, assuming that the capacitor capacity and the protection cut-off set time length of the dc converter station are consistent by default, the total recovery time of the voltage at the dc landing point is as follows:
Figure BDA0002815089470000022
in the formula, the first condition is that the number of capacitors in the direct current converter station is enough to meet the requirement of cutting recovery voltage, and the second condition is a calculation formula that the number of capacitors in the direct current converter station is not enough; n is the maximum group number of the switchable capacitors in the direct current converter station; q c And S c The capacitance of a capacitor in the direct current converter station (the default capacitor has the same standard) and the sensitivity of the voltage of a ground point to reactive injection of the capacitor are respectively set, the time for protecting and cutting off the capacitor after a fault occurs is short, and the sensitivity of the default capacitor to the voltage of a node of the fault point is consistent; t is t c Setting time for protecting and cutting off the capacitor; v p And
Figure BDA0002815089470000023
respectively meeting the requirements of the DC blocking front voltage of a receiving end DC grounding point and the upper limit of the node voltage after the fault;
Figure BDA0002815089470000024
the voltage variation of a receiving end direct current floor point after the direct current fault;
Figure BDA0002815089470000025
in order to round up the symbol,
Figure BDA0002815089470000026
in order to consider that the capacitors are discrete quantities, the number of the capacitors which need to be cut off is recovered by the voltage of the direct current grounding point.
Further, the dynamic reactive power demand in the direct current converter station in step 2 is as follows:
Figure BDA0002815089470000027
in the formula, t ref After the fault of the receiving end direct current floor pointVoltage recovery time requirements; s g The reactive sensitivity of the voltage of the direct current floor point to a dynamic reactive power source of the direct current converter station is obtained; t is the total voltage recovery time of the direct current grounding point; n is the maximum group number of the switchable capacitors in the direct current converter station; q c And S c Respectively the capacity of a capacitor in the direct current converter station; t is t c Setting time for protecting and cutting off the capacitor; v p And
Figure BDA0002815089470000028
respectively meeting the requirements of the DC blocking front voltage of a receiving end DC grounding point and the upper limit of the node voltage after the fault;
Figure BDA0002815089470000029
the voltage variation of a receiving end direct current floor point after the direct current fault; the dynamic reactive power demand delta Q is less than or equal to 0 according to the expression.
The invention also discloses a system for solving the dynamic reactive power requirement of the receiving end direct current converter station, which comprises the following steps:
the voltage variation obtaining module after the DC convertor station floor point fault comprises: the method comprises the steps of obtaining the voltage variation of a direct current grounding point after a direct current fault;
the total recovery time calculation module of the voltage of the direct current floor point comprises: the voltage recovery time calculation method is used for calculating the total voltage recovery time of the direct current grounding point after the direct current fault;
a dynamic reactive power demand calculation module in the direct current converter station: the method is used for solving the reactive demand of the rapid dynamic reactive power source in the direct current converter station.
Preferably, the module for acquiring voltage variation after the dc converter station landing point fault analyzes the dc fault of the power grid based on the analysis of the expected N-1 fault, and calculates the voltage variation before and after the fault of the dc landing point
Figure BDA0002815089470000031
The total recovery time calculation module of the voltage of the direct current floor point is used for obtaining the reactive injection sensitivity S of the voltage of the floor point in the direct current converter station to the capacitor based on the sensitivity calculation c And according to the capacity and quantity of the capacitors in the direct current near region and the time length of protection cuttingCalculating the total recovery time t of the voltage of the direct current floor point; the dynamic reactive power demand calculation module in the direct current converter station calculates the dynamic reactive power demand delta Q in the direct current converter station by comparing the total voltage recovery time of the direct current floor point based on the voltage recovery time requirement of the direct current floor point.
Compared with the prior art, the invention has the following beneficial effects:
the method comprehensively considers the voltage level of the receiving end of the extra-high voltage direct current transmission power grid, analyzes the direct current transmission power return-to-zero fault caused by direct current single-pole or double-pole blocking, judges whether the power grid at the receiving end side can meet the voltage safety level after the fault in time or not based on the parameters such as the fault voltage recovery speed, the voltage recovery amplitude value, the time requirement and the like of the direct current converter station at the receiving end side, and provides reference for dynamic rapid reactive power source capacity configuration in the direct current converter station. According to the invention, the serious fault recovery degree caused by the current extra-high voltage direct current transmission is analyzed and calculated according to the relation of various parameters such as the capacitor capacity of the receiving end direct current converter station, the capacitor protection cutting time and the like, the voltage level of the extra-high voltage receiving end is evaluated, and a good technical support effect is played for the extra-high voltage direct current safe transmission. In addition, the calculation of the method is based on the power grid parameters and the demand indexes which are convenient to collect, the calculation is simple, the applicability is strong, and the method has the inevitable convergence characteristic.
Drawings
FIG. 1 is a flow chart of the present invention for solving dynamic reactive power requirements of a receiving end DC converter station;
fig. 2 is a system block diagram for solving the dynamic reactive power requirement of the receiving end direct current converter station according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The invention discloses a method for solving dynamic reactive power requirements of a receiving-end direct current converter station, which comprises the following steps of:
step 1: calculating the voltage variation of a direct current floor point at a receiving end after the direct current fault is blocked by scanning the traditional fault N-1;
step 2: and calculating the total recovery time of the voltage of the direct current grounding point according to the parameters such as the capacity and the number of capacitors of the receiving end direct current converter station, the setting of protection cutting time and the like and the requirement of the upper limit of the voltage of the direct current grounding point.
And step 3: and (3) comparing the total recovery time of the voltage of the direct current grounding point in the step (2) based on the voltage recovery time requirement of the direct current grounding point, and calculating the dynamic reactive power demand in the direct current convertor station.
The application of the steps of the invention is realized under certain assumed conditions, and the specific assumed conditions are as follows:
1) the capacity of a capacitor in the direct current converter station is consistent with the set time of protection cutting, and the voltage-reactive sensitivity of the capacitor to a direct current drop point is consistent.
2) After the ultrahigh voltage direct current is subjected to unipolar or bipolar locking, the structure of a power grid is not changed in the period of short capacitor protection and removal of a receiving-end power grid in a direct current converter station, and a reactive power source near a direct current fault grounding point is not changed greatly.
In the implementation of the invention, firstly, the voltage variation of a receiving end direct current grounding point after the direct current fault is locked is calculated through the scanning of the traditional fault N-1, the total recovery time t of the voltage of a transmitting node is calculated according to the parameters of the capacity and the quantity of capacitors of a receiving end direct current converter station, the setting of protection cutting time and the like and the requirement of the upper limit of the voltage of the transmitting node of the direct current grounding point, and the expression is as follows:
Figure BDA0002815089470000041
wherein j is 1,2,3 …, and m is the cut capacitor bank number; t is t c,j Setting a time length for cutting off the protection of the jth group of capacitors; s c,j And Q c,j Respectively the node voltage sensitivity and the capacity of the jth group of capacitors to fault points, and the product of the node voltage sensitivity and the capacity is the voltage variation of the grounding point of the cut-off capacitor; v p And
Figure BDA0002815089470000042
respectively meeting the requirements of the DC blocking front voltage of a receiving end DC floor point and the voltage upper limit of an outgoing node;
Figure BDA0002815089470000043
the voltage variation of the direct current receiving end before and after the direct current blocking is calculated through fault scanning.
By assuming the condition 1), the capacitor capacity and the protection cut-off time length of the dc converter station are generally set to be consistent by default, and the total recovery time of the voltage of the outgoing node of the dc converter station can be expressed as:
Figure BDA0002815089470000044
in the formula, the first condition is that the number of capacitors in the direct current converter station is enough to meet the requirement of cutting recovery voltage, and the second condition is a calculation formula that the number of capacitors in the direct current converter station is not enough; n is the maximum group number of the switchable capacitors in the direct current converter station; q c And S c The capacitance of a capacitor in the direct current converter station (the default capacitor has the same standard) and the sensitivity of the voltage of a ground point to reactive injection of the capacitor are respectively set, the time for protecting and cutting off the capacitor after a fault occurs is short, and the sensitivity of the default capacitor to the voltage of a node of the fault point is consistent; t is t c Setting time for protecting and cutting off the capacitor; v p And
Figure BDA0002815089470000051
the direct current blocking front voltage and the fault rear node voltage upper limit requirement of a receiving end direct current grounding point are respectively met;
Figure BDA0002815089470000052
the voltage variation of the receiving end direct current landing point after the direct current fault.
Figure BDA0002815089470000053
Is a rounded up symbol;
Figure BDA0002815089470000054
in order to consider that the capacitors are discrete quantities, the capacitors needing to be cut off for voltage recovery of the direct current grounding point are counted in a whole number.
Further, comparing the total recovery time of the voltage of the outgoing node with the requirement of the voltage recovery time of the direct current floor point, and calculating the initial requirement of the voltage of the outgoing node. The expression is as follows:
Figure BDA0002815089470000055
in the formula, t ref The voltage recovery time requirement is the voltage recovery time requirement after the fault of the receiving end direct current grounding point; s g The reactive sensitivity of the voltage of the direct current floor point to a dynamic reactive power source of the direct current converter station is obtained; t is the total voltage recovery time of the direct current grounding point, and n is the maximum group number of the switchable capacitors in the direct current converter station; q c And S c Respectively the capacity of a capacitor in the direct current converter station; t is t c Setting time for protecting and cutting off the capacitor; v p And
Figure BDA0002815089470000056
respectively meeting the requirements of the DC blocking front voltage of a receiving end DC grounding point and the upper limit of the node voltage after the fault;
Figure BDA0002815089470000057
the voltage variation of the receiving end direct current landing point after the direct current fault. The dynamic reactive power demand delta Q is less than or equal to 0 according to the expression. The method comprises the following steps that 3 conditional expressions can be divided according to whether the capacitor cutting time length of a direct current converter station meets the time requirement or not and whether the capacitor cutting capacity meets the voltage recovery requirement or not, the first conditional expression is an expression that the capacitor which can be cut in the direct current converter station meets both the time requirement of a delivery node and the voltage recovery requirement condition, the second conditional expression is an expression that the capacitor which can be cut in the direct current converter station meets the time requirement but does not meet the voltage recovery requirement condition, and the third conditional expression is an expression that the capacitor in the direct current converter station can not meet both the time requirement and the voltage recovery requirement.
The system for solving the dynamic reactive power requirement of the receiving end direct current converter station only comprises the following modules:
method for acquiring voltage variation after floor fault of direct current converter stationA module: the method is used for acquiring the voltage variation of the direct current floor point after the direct current fault, analyzing the direct current fault after the power grid based on the expected N-1 fault analysis, and calculating the voltage variation of the direct current floor point before and after the fault
Figure BDA0002815089470000058
The total recovery time calculation module of the voltage of the direct current floor point comprises: the method is used for calculating the total voltage recovery time of the direct current grounding point after the direct current fault, and obtaining the reactive injection sensitivity S of the grounding point voltage in the direct current converter station to the capacitor c And calculating the total recovery time t of the voltage of the direct current floor point according to the capacity and the quantity of the capacitors in the direct current near area and the protection cutting time.
A dynamic reactive power demand calculation module in the direct current converter station: the method is used for solving the reactive power demand of the rapid dynamic reactive power source in the direct current converter station, comparing the total voltage recovery time of the direct current grounding point based on the voltage recovery time demand of the direct current grounding point, and calculating the dynamic reactive power demand delta Q in the direct current converter station.
The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (3)

1. A method for solving dynamic reactive power requirements of a receiving end direct current converter station is characterized by comprising the following steps:
step 1: calculating the voltage change quantity of a receiving end direct current grounding point after the direct current fault is blocked through traditional N-1 fault scanning, and calculating the total voltage recovery time of the direct current grounding point according to the capacity and quantity of capacitors of a receiving end direct current converter station, protection cut-off time setting and the upper limit requirement parameter of the direct current grounding point node voltage;
step 2: comparing the total voltage recovery time of the direct current grounding point with the voltage recovery time demand to calculate the dynamic reactive power demand of the direct current converter station;
the total voltage recovery time of the direct current grounding point in the step 1 is as follows:
Figure FDA0003699062330000011
wherein j is 1,2,3 …, and m is the cut capacitor bank number; t is t c,j Setting a time length for cutting off the protection of the jth group of capacitors; s c,j And Q c,j The node voltage sensitivity and the capacity of the jth group of capacitors to a fault point are respectively, and the product of the node voltage sensitivity and the capacity is the voltage variation of a grounding point of the cut-off capacitor; v p And
Figure FDA0003699062330000012
respectively meeting the requirements of the DC blocking front voltage of a receiving end DC grounding point and the upper limit of the node voltage after the fault;
Figure FDA0003699062330000013
the voltage variation of a receiving end direct current floor point after the direct current fault;
assuming that the capacitor capacity and the protection cut-off set time length of the direct current converter station are consistent by default, the total recovery time of the voltage of the direct current grounding point is as follows:
Figure FDA0003699062330000014
in the formula, the first condition is that the number of capacitors in the direct current converter station is enough to meet the requirement of cutting recovery voltage, and the second condition is a calculation formula that the number of capacitors in the direct current converter station is not enough; n is the maximum group number of the switchable capacitors in the direct current converter station; q c And S c The capacitor capacity in the direct current converter station and the reactive injection sensitivity of the voltage of the grounding point to the capacitor are respectively set, the default capacitor has the same standard, the time for protecting and cutting off the capacitor after the fault occurs is short, and the node voltage sensitivity of the default capacitor to the fault point is consistent; t is t c Setting time for protecting and cutting off the capacitor; v p And
Figure FDA0003699062330000015
respectively meeting the requirements of the DC blocking front voltage of a receiving end DC grounding point and the upper limit of the node voltage after the fault;
Figure FDA0003699062330000021
the voltage variation of a receiving end direct current floor point after the direct current fault;
Figure FDA0003699062330000022
in order to round up the symbol,
Figure FDA0003699062330000023
in order to consider that the capacitors are discrete quantities, the number of the capacitors needing to be cut off is recovered by the voltage of the direct current grounding point;
the dynamic reactive power demand in the direct current converter station in the step 2 is as follows:
Figure FDA0003699062330000024
in the formula, t ref The voltage recovery time requirement is the voltage recovery time requirement after the fault of the receiving end direct current grounding point; s g The reactive sensitivity of the voltage of the direct current floor point to a dynamic reactive power source of the direct current converter station is obtained; t is the total voltage recovery time of the direct current grounding point; n is the maximum group number of the switchable capacitors in the direct current converter station; q c And S c Reactive injection sensitivities of the capacitor capacity and the voltage of the grounding point in the direct current converter station to the capacitor are respectively set; t is t c Setting time for protecting and cutting off the capacitor; v p And
Figure FDA0003699062330000025
respectively meeting the requirements of the DC blocking front voltage of a receiving end DC grounding point and the upper limit of the node voltage after the fault;
Figure FDA0003699062330000026
for receiving-end dc landing point after dc faultA voltage variation; the dynamic reactive power demand delta Q is less than or equal to 0 according to the expression.
2. A system for solving the dynamic reactive power requirement of the receiving end dc converter station according to claim 1, comprising:
the voltage variation obtaining module after the DC convertor station floor point fault comprises: the method comprises the steps of obtaining the voltage variation of a direct current grounding point after a direct current fault;
the total recovery time calculation module of the voltage of the direct current floor point comprises: the voltage recovery time calculation method is used for calculating the total voltage recovery time of the direct current grounding point after the direct current fault;
a dynamic reactive power demand calculation module in the direct current converter station: the method is used for solving the reactive demand of the rapid dynamic reactive power source in the direct current converter station.
3. The system according to claim 2, wherein the module for obtaining the voltage variation after the dc converter station landing point fault analyzes the dc fault of the power grid based on the expected N-1 fault analysis, and calculates the voltage variation before and after the dc landing point fault
Figure FDA0003699062330000027
The total recovery time calculation module of the voltage of the direct current floor point is used for obtaining the reactive injection sensitivity S of the voltage of the floor point in the direct current converter station to the capacitor based on the sensitivity calculation c Calculating the total recovery time t of the voltage of the direct current floor point according to the capacity and the quantity of the capacitors in the direct current near area and the protection cutting time; the dynamic reactive power demand calculation module in the direct current converter station calculates the dynamic reactive power demand in the direct current converter station by comparing the total voltage recovery time of the direct current floor point based on the voltage recovery time demand of the direct current floor point.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104167754A (en) * 2014-06-30 2014-11-26 南方电网科学研究院有限责任公司 VDCOL control parameter optimization method in multi-feed-in direct current recovery process
CN104899677A (en) * 2015-05-06 2015-09-09 广东工业大学 Quick estimation method for load maximum reactive power command of 500kv radial power supply network in disruption recovery

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104167754A (en) * 2014-06-30 2014-11-26 南方电网科学研究院有限责任公司 VDCOL control parameter optimization method in multi-feed-in direct current recovery process
CN104899677A (en) * 2015-05-06 2015-09-09 广东工业大学 Quick estimation method for load maximum reactive power command of 500kv radial power supply network in disruption recovery

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