CN115189362A

CN115189362A - Method and device for controlling reactive voltage in direct current transmission end power grid and electronic equipment

Info

Publication number: CN115189362A
Application number: CN202210727140.3A
Authority: CN
Inventors: 刘京波; 吴林林; 李琰; 张扬帆; 吴宇辉; 龚超; 李蕴红; 巩宇; 张�浩
Original assignee: Electric Power Research Institute of State Grid Jibei Electric Power Co Ltd
Current assignee: Electric Power Research Institute of State Grid Jibei Electric Power Co Ltd
Priority date: 2022-06-24
Filing date: 2022-06-24
Publication date: 2022-10-14

Abstract

The disclosure provides a reactive voltage control method and device in a direct current transmission end power grid and electronic equipment. The main technical scheme comprises: reading an initial data section of a new energy direct current transmission end power grid; judging the operation mode of the new energy direct current transmission end power grid according to the power grid model topological relation of the converter station; calculating reactive power adjustment quantities corresponding to all power plant units in the direct current transmission end power grid respectively according to the initial section data and the operation mode; and adjusting parameters of the new energy direct current transmission end power grid according to the reactive adjustment quantity of the new energy power plant unit. The reactive voltage control method for multi-mode switching of the flexible direct transmission end power grid alternating current networking and the island system is realized. By coordinating the new energy power plant unit, the reactive power regulation capability of the new energy cluster is fully exerted, and the purpose of ensuring the safe and stable operation of reactive voltage in the new energy direct current sending end power grid island mode is achieved, so that the automatic voltage control level of the new energy direct current sending end power grid is improved.

Description

Method and device for controlling reactive voltage in direct current transmission end power grid and electronic equipment

Technical Field

The present disclosure relates to the field of power grid dispatching technologies, and in particular, to a method and an apparatus for controlling reactive voltage in a dc transmission-side power grid, and an electronic device.

Background

In order to deal with global climate change and energy crisis, low-carbon transformation is realized to become the main melody of the development of the power industry in the world, china continuously promotes the adjustment of industrial structure and energy structure, proposes the double-carbon targets of 2030 'carbon peak reaching' and 2060 'carbon neutralization', constructs a novel power system taking new energy as a main body, and is one of the most main measures for realizing carbon peak reaching and carbon neutralization.

Considering that a new energy collection area in China is generally located in remote areas such as deserts, gobi and deserts, the new energy consumption capacity of the place where a large-scale wind power photovoltaic power generation project is located is relatively limited, a new energy power transmission and transformation transmission system matched with the new energy collection area needs to be built to solve the problems of transmission and consumption caused by large-scale new energy grid connection, wherein a flexible direct current transmission (called flexible direct current for short) technology has very important significance for power grid dispatching.

The converter station of the flexible direct-current transmission end needs to take two operation modes of alternating-current networking and alternating-current isolated island into consideration, namely the converter station of the flexible direct-current transmission end operates in the alternating-current isolated island mode under the normal condition, a direct-current system of a new energy power plant accessed to the converter station realizes grid-connected power generation, the converter station is automatically switched to the alternating-current networking mode when the direct-current system of the converter station is overhauled, and the new energy power plant is accessed to the alternating-current system of the converter station to realize grid-connected power generation.

A flexible direct-transmitting end island system which is purely composed of millions of kilowatt new energy and a single converter station is found for the first time in the world, and no relevant experience can be used for reference at home and abroad. The flexible direct-current end converter station in the island mode is similar to an infinite node, the operation constraint of the flexible direct-current end converter station is rigid constraint, and the whole system is unstable once the operation constraint is out of limit. In addition, the reactive voltage control mode and strategy of the new energy cluster in the island mode are greatly different from those of a conventional alternating current power grid, and higher requirements are provided for the reactive voltage of the new energy station.

Disclosure of Invention

The disclosure provides a reactive voltage control method and device in a direct current transmission end power grid and electronic equipment. The reactive voltage control method mainly aims to realize multi-mode switching of the alternating current networking and alternating current isolated island of the new energy direct current transmission end power grid.

According to a first aspect of the present disclosure, a method for controlling reactive voltage in a dc-link power grid is provided, wherein the method includes:

reading an initial data section of a new energy direct current transmission end power grid;

judging the operation mode of the new energy direct current transmission end power grid according to the power grid model topological relation of the converter station;

calculating reactive power adjustment quantities corresponding to all power plant units in the direct current transmission end power grid respectively according to the initial section data and the operation mode;

and adjusting parameters of the new energy direct current transmission end power grid according to the reactive adjustment quantity of the new energy power plant unit.

Optionally, the reading of the initial section data of the new energy source sending end power grid includes:

according to a preset control period T, in a new energy direct current transmission end power grid model M _c Reading the corresponding initial data section;

the initial section data comprises active power of a line, reactive power of the line, the voltage state of a bus needing to be monitored, the running state of a new energy unit and the reactive power sensitivity of the new energy unit in a new energy direct current transmission end power grid.

Optionally, the determining, according to the power grid model topological relation of the converter station, an operation mode of the new energy direct current transmission end power grid includes:

if an electrical connection relationship exists between an online collection bus of a new energy power plant in a converter station and a direct current system of the converter station and the electrical connection relationship is disconnected with a main transformer of the converter station, determining that the operation mode of a new energy direct current transmission end power grid is an alternating current island mode;

and if the new energy power plant on-line collection bus in the converter station has an electrical connection relationship with a main transformer of the converter station and is disconnected from a direct current system of the converter station, determining that the operation mode of the new energy direct current transmission end power grid is an alternating current networking mode.

Optionally, the method further includes:

setting an automatic voltage control mode of the alternating current island mode as a constant voltage control mode;

and setting the automatic voltage control mode of the alternating current networking mode as a variable voltage control mode.

Optionally, when it is determined that the operation mode of the new energy dc transmission end power grid is the variable voltage control mode, calculating reactive power adjustment amounts respectively corresponding to each power plant unit in the dc transmission end power grid according to the initial section data and the operation mode includes:

get the T th ₀ Time-of-day converter station bus voltage information V _s,0,p Reactive voltage sensitivity information Sen of new energy power plant unit ₀ Optimal target set value of central bus voltage of converter station

Converting the bus voltage information V of the converter station _s，0，p Reactive voltage sensitivity information Sen of new energy power plant unit ₀ Optimal target set value of central bus voltage of converter station

Respectively inputting the first minimum objective function to obtain the reactive power adjustment quantity delta Q of the new energy power plant unit _g,0 。

Optionally, the adjusting the parameter of the new energy direct current transmission end power grid according to the reactive power adjustment quantity of the new energy power plant unit includes:

according to the reactive power adjustment quantity delta Q of the new energy power plant unit _g,0 And new energy power plant unit reactive sensitivity information Sen ₀ And calculating to obtain the adjustment quantity delta V of the voltage of the high-voltage side bus of the new energy power plant ^h _s,0 ；

According to the adjustment quantity delta V of the high-voltage side bus voltage of the new energy power plant ^h _s,0 And the reactive sensitivity information Sen of the new energy power plant unit ₀ For new energy power plant unit at Tth ₀ Updating the initial reactive power at the moment;

according to the latest new energy DC transmitting end power grid initial data section F _m,0 Can obtain the updated data section F of the new energy direct current transmission end power grid _m,1 ，F _m,1 As the T th ₀ And the data section of the new energy direct current transmission end power grid at the moment +1 provides data support for the next round of automatic voltage control, and the automatic voltage control function of the new energy direct current transmission end power grid in the alternating current networking mode is realized.

Optionally, when it is determined that the operation mode of the new energy direct current transmission end power grid is the constant voltage control mode, adjusting the parameter of the new energy direct current transmission end power grid according to the reactive power adjustment quantity of the new energy power plant unit includes:

acquiring initial reactive power information Gen of new energy power plant unit _0,q Reactive voltage sensitivity information Sen of new energy power plant unit ₀ At the T-th ₀ Initial reactive power accumulation Gate of moment _0,q ；

The initial reactive power information Gen of the new energy power plant unit _0,q Reactive voltage sensitivity information Sen of new energy power plant unit ₀ At the T-th ₀ Initial reactive power accumulation Gate of moment _0,q Inputting a second minimum objective function to obtain the reactive power adjustment quantity delta Q of the new energy power plant unit _g,0 。

Optionally, the adjusting, according to the reactive power adjustment amount of the new energy power plant unit, parameters of the new energy direct current transmission end power grid includes:

according to the reactive power adjustment quantity delta Q of the new energy power plant unit _g,0 To and new energy power plant unit reactive sensitivity information Sen ₀ For new energy power plant unit at the T ₀ Updating the initial reactive power at the moment, the voltage of the high-voltage side bus and the voltage information of the converter station bus;

by adjusting the initial data section F of the new energy direct current transmission end power grid _m,0 Obtaining updated data section F of new energy direct current transmission end power grid _m,1 ，F _m,1 As the T th ₀ And the data section of the new energy direct current transmission end power grid at the moment +1 provides data support for the next round of automatic voltage control, and the automatic voltage control function of the new energy direct current transmission end power grid in an island mode is realized.

Optionally, the method further includes:

with a predetermined control period T _c Taking the new energy direct current transmission end power grid converter station as a unit, and periodically checking the power grid model topological state of the new energy direct current transmission end power grid converter station;

will T ₁ The data section of the new energy direct current transmission end power grid at the moment is used as T ₁ The initial data section of the cycle is subject to automatic voltage control for the next cycle.

According to a second aspect of the present disclosure, there is provided an apparatus for reactive voltage control in a dc-link power grid, comprising:

the reading unit is used for reading an initial data section of a new energy direct current transmission end power grid;

the judging unit is used for judging the operation mode of the new energy direct current transmission end power grid according to the power grid model topological relation of the converter station;

the calculation unit is used for calculating reactive power adjustment quantities corresponding to all power plant units in the direct current transmission end power grid according to the initial section data and the operation mode;

and the adjusting unit is used for adjusting the parameters of the new energy direct current transmission end power grid according to the reactive adjustment quantity of the new energy power plant unit.

Optionally, the reading unit is further configured to:

reading a corresponding initial data section from a new energy direct current transmission end power grid model M according to a preset clock;

the initial section data comprises active power of a line, reactive power of the line, the voltage state of a bus needing to be monitored, the running state of a new energy unit and the reactive power sensitivity of the new energy unit in the new energy direct current transmission end power grid.

Optionally, the determining unit includes:

the device comprises a first determining module, a second determining module and a third determining module, wherein the first determining module is used for determining that the operation mode of the new energy direct current transmission end power grid is an alternating current island mode if a new energy power plant online collection bus in a converter station has an electrical connection relationship with a direct current system of the converter station and is disconnected from a main transformer of the converter station;

and the second determining module is used for determining that the operation mode of the new energy direct current transmission end power grid is an alternating current networking mode if the new energy power plant online collection bus in the converter station has an electrical connection relationship with a main transformer of the converter station and is disconnected from a direct current system of the converter station.

Optionally, the determining unit further includes:

the first setting unit is used for setting an automatic voltage control mode of the alternating current island mode to be a constant voltage control mode;

and the second setting unit is used for setting the automatic voltage control mode of the alternating current networking mode into a variable voltage control mode.

Optionally, when it is determined that the operation mode of the new energy direct current transmission end power grid is the variable voltage control mode, the calculating unit includes:

a first obtaining module for obtaining the Tth ₀ Time-of-day converter station bus voltage information V _s,0,p Reactive voltage sensitivity information Sen of new energy power plant unit ₀ Optimal target set value of central bus voltage of converter station

A first input module for inputting the converter station bus voltage information V _s，0，p Reactive voltage sensitivity information Sen of new energy power plant unit ₀ Optimal target set value of central bus voltage of converter station

Respectively inputting a first minimum objective function to obtain a reactive power adjustment quantity delta Q of the new energy power plant unit _g,0 。

Optionally, the adjusting unit includes:

a calculation module used for calculating the reactive adjustment quantity delta Q of the new energy power plant unit _g,0 And new energy power plant unit reactive sensitivity information Sen ₀ And calculating to obtain the adjustment quantity delta V of the voltage of the high-voltage side bus of the new energy power plant ^h _s,0 ；

A first updating module used for adjusting the delta V according to the voltage of the high-voltage side bus of the new energy power plant ^h _s,0 And the reactive sensitivity information Sen of the new energy power plant unit ₀ For new energy power plant unit at Tth ₀ Updating the initial reactive power at the moment;

a first circulation module for generating a new energy DC transmission end power grid initial data section F according to the latest new energy DC transmission end power grid initial data section _m,0 Can obtain the updated data section F of the new energy direct current transmission end power grid _m,1 ，F _m,1 As the T th ₀ And the data section of the new energy direct current transmission end power grid at the moment +1 provides data support for the next round of automatic voltage control, and the automatic voltage control function of the new energy direct current transmission end power grid in the alternating current networking mode is realized.

Optionally, when it is determined that the operation mode of the new energy dc transmission end power grid is the constant voltage control mode, the calculating unit includes:

a second acquisition module for acquiring initial reactive information Gen of the new energy power plant unit _0,q Reactive voltage sensitivity information Sen of new energy power plant unit ₀ At the T-th ₀ Initial reactive power accumulation Gate of moment _0,q ；

A second input module for inputting the initial reactive information Gen of the new energy power plant unit _0,q Reactive voltage sensitivity information Sen of new energy power plant unit ₀ At the T-th ₀ Initial reactive power accumulation Gate of moment _0,q Input ofThe second minimization objective function is used for obtaining the reactive power adjustment quantity delta Q of the new energy power plant unit _g,0 。

Optionally, the adjusting unit includes:

a second updating module used for adjusting the quantity delta Q according to the reactive power of the new energy power plant unit _g,0 To and new energy power plant unit reactive sensitivity information Sen ₀ For new energy power plant unit at the T ₀ Updating the initial reactive power at the moment, the voltage of the high-voltage side bus and the voltage information of the converter station bus;

a second circulation module for adjusting the initial data section F of the new energy direct current transmission end power grid _m,0 Obtaining updated data section F of new energy direct current transmission end power grid _m,1 ，F _m,1 As the T th ₀ And the data section of the new energy direct current transmission end power grid at the moment +1 provides data support for the next round of automatic voltage control, and the automatic voltage control function of the new energy direct current transmission end power grid in an island mode is realized.

Optionally, the apparatus further comprises:

a checking unit for checking the control period T _c Taking the new energy direct current transmission end power grid converter station as a unit, and periodically checking the power grid model topological state of the new energy direct current transmission end power grid converter station;

a circulation unit for circulating T ₁ The data section of the new energy direct current transmission end power grid at the moment is taken as T ₁ And carrying out automatic voltage control on the next period on the initial data section of the period.

According to a third aspect of the present disclosure, there is provided an electronic device comprising:

at least one processor; and

a memory communicatively coupled to the at least one processor; wherein,

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of the first aspect.

According to a fourth aspect of the present disclosure, there is provided a non-transitory computer readable storage medium having stored thereon computer instructions for causing the computer to perform the method of the aforementioned first aspect.

According to a fifth aspect of the present disclosure, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the method as set forth in the preceding first aspect.

The disclosure provides a reactive voltage control method and device in a direct current transmission end power grid and electronic equipment. The main technical scheme comprises: reading an initial data section of a new energy direct current transmission end power grid; judging the operation mode of the new energy direct current transmission end power grid according to the power grid model topological relation of the converter station; calculating reactive power adjustment quantities corresponding to all power plant units in the direct current transmission end power grid respectively according to the initial section data and the operation mode; and adjusting parameters of the new energy direct current transmission end power grid according to the reactive power adjustment quantity of the new energy power plant unit. The reactive voltage control method realizes the multi-mode switching of the flexible direct-transmission end grid alternating current networking and island system. By coordinating the new energy power plant unit, the reactive power regulation capability of the new energy cluster is fully exerted, and the purpose of ensuring the safe and stable operation of reactive voltage in the new energy direct current sending end power grid island mode is achieved, so that the automatic voltage control level of the new energy direct current sending end power grid is improved.

It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present application, nor do they limit the scope of the present application. Other features of the present application will become apparent from the following description.

Drawings

The drawings are included to provide a better understanding of the present solution and are not to be construed as limiting the present disclosure. Wherein:

fig. 1 is a schematic flowchart of a method for controlling reactive voltage in a dc link power grid according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of an ac island mode of a new energy dc transmission grid according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of an ac networking mode of a new energy dc transmission grid according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a device for controlling reactive voltage in a dc link power grid according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of another apparatus for controlling reactive voltage in a dc-link power grid according to an embodiment of the present disclosure;

fig. 6 is a schematic block diagram of an example electronic device 600 provided by embodiments of the present disclosure.

Detailed Description

Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings, in which various details of embodiments of the present disclosure are included to assist understanding, and which are to be considered as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the disclosure. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.

The following describes a method and an apparatus for reactive voltage control in a dc-link power grid, and an electronic device according to an embodiment of the present disclosure with reference to the drawings.

Fig. 1 is a schematic flowchart of a method for controlling reactive voltage in a dc link power grid according to an embodiment of the present disclosure.

As shown in fig. 1, the method comprises the following steps:

step 101, reading an initial data section of a new energy direct current transmission end power grid.

Setting the clock of the new energy direct current transmission end power grid to be T _m Reading T from the new energy direct current transmission end power grid model M _m ＝T ₀ Initial data section F corresponding to time _m,0 。F _m,0 The method comprises the following steps of providing information of active power and reactive power of a line, a bus voltage state needing to be monitored, a new energy unit operation state, reactive power sensitivity of the new energy unit and the like in a new energy direct current transmission end power grid:

F _m,0 ＝{Ln _0,p ,Ln _0,q ,Bs ₀ ,Gen ₀ ,Sen ₀ }

wherein, subscript m,0 corresponds to clock T of new energy direct current transmission end electric network _m ，T _m At an initial time T ₀ New energy Unit Gen ₀ The model is an equivalent generator model (non-actual new energy generator) on the low-voltage side of the new energy power plant.

And 102, judging the operation mode of the new energy direct current transmission end power grid according to the power grid model topological relation of the converter station.

Setting the current operation mode of a new energy direct current transmission end power grid to be M _d ；

M _d ＝{M _nom ,M _isd }

Wherein M is _nom Corresponding to the AC networking mode, M _isd Corresponding to an ac islanding mode.

and setting an automatic voltage control mode of the alternating current networking mode as a variable voltage control mode.

And 103, calculating reactive power adjustment quantities corresponding to all power plant units in the direct current transmission end power grid according to the initial section data and the operation mode.

Is set at the T-th ₀ The running mode of the new energy direct current transmission end power grid at any moment is M _d ＝M _isd The automatic voltage control mode corresponding to the operation mode (ac island mode) is a constant voltage control mode, that is:

Strg _m ＝[Strg _q ]

set at the T-th ₀ The running mode of the new energy direct current transmission end power grid at any moment is M _d ＝M _nom The automatic voltage control mode corresponding to the operation mode (ac networking mode) is a variable voltage control mode, that is:

Strg _m ＝[Strg _u ]

and calculating reactive power adjustment amounts corresponding to all power plant units in the direct current transmission end power grid according to different voltage control modes.

And 104, adjusting parameters of the new energy direct current transmission end power grid according to the reactive power adjustment quantity of the new energy power plant unit. Adjusting the reactive power output of the new energy power plant unit according to the reactive power adjustment quantity of the new energy power plant unit;

adjusting the reactive adjustment quantity of the outgoing line of the new energy power plant according to the reactive adjustment quantity of the new energy power plant unit;

adjusting a high-voltage side bus of the new energy power plant according to the reactive adjustment quantity of the new energy power plant unit;

and adjusting the bus voltage of the converter station according to the reactive power adjustment quantity of the new energy power plant unit.

The present disclosure provides a method for reactive voltage control in a dc delivery side grid. The main technical scheme comprises: reading an initial data section of a new energy direct current transmission end power grid; judging the operation mode of the new energy direct current transmission end power grid according to the power grid model topological relation of the converter station; calculating reactive power adjustment quantities corresponding to all power plant units in the direct current transmission end power grid according to the initial section data and the operation mode; and adjusting parameters of the new energy direct current transmission end power grid according to the reactive power adjustment quantity of the new energy power plant unit. The reactive voltage control method realizes the multi-mode switching of the flexible direct-transmission end grid alternating current networking and island system. By coordinating the new energy power plant unit, the reactive power regulation capability of the new energy cluster is fully exerted, the purpose of ensuring the safe and stable operation of reactive voltage in an island mode of the new energy direct current sending end power grid is achieved, and therefore the automatic voltage control level of the new energy direct current sending end power grid is improved.

As a possible way of the embodiment of the present application, the following method may be adopted, but not limited to:

further, in this disclosure, the reading of the initial section data of the new energy source sending end power grid includes:

(2) Setting new energy DC transmission end electric networkThe clock being T _m Reading T from the new energy direct current transmission end power grid model M _m ＝T ₀ Initial data section F corresponding to time _m,0 ，F _m,0 The method comprises the following steps of providing information of active power and reactive power of a line, a bus voltage state needing to be monitored, a new energy unit operation state, reactive power sensitivity of the new energy unit and the like in a new energy direct current transmission end power grid:

F _m,0 ＝{Ln _0,p ,Ln _0,q ,Bs ₀ ,Gen ₀ ,Sen ₀ }

(2-1) setting the outlet number of the new energy power plant in the new energy direct current sending end power grid to be L, L =1 \8230 \ 8230;, L, L represents the total outlet number of the new energy power plant in the new energy direct current sending end power grid model M, and Ln _0,p And Ln _0,q Outgoing line for new energy power plant is at the T ₀ The initial active and the initial reactive at a moment.

Ln _0,p ＝[l,l＝1,..L]{P _0,l }

Ln _0,q ＝[l,l＝1,..L]{Q _0,l }

Wherein, P _0,l And Q _0,l The outgoing lines of the first new energy power plant are respectively on the T th ₀ Real power and initial reactive power at a moment;

(2-2) setting the serial number of a bus needing to be monitored in the new energy direct current transmission end power grid to be S, setting S =1 as new S, wherein S represents the total number of buses needing to be monitored in a new energy direct current transmission end power grid model M, and V _0,p And V _0,h Are respectively the T-th ₀ And (4) initial state information of the alternating-current bus voltage of the converter station and the high-voltage side bus voltage of the new energy power plant in the new energy direct-current transmitting end power grid at the moment.

Bs ₀ ＝[s,s＝1,..S]{V _s,0,p ,V _s,0,h }

Wherein, V _s,0,p And V _s,0,h The AC bus and the new energy power of the convertor station which need to be monitored respectively for the s-thThe high-voltage side bus of the plant is at the T ₀ Voltage status information of the time of day.

(2-2-1) setting the s-th converter station bus needing to be monitored at the T-th ₀ Voltage information of time is V _s,0,p The composition is as follows:

V _s，0，p ＝{V ^p _s，0，val ，V ^p _s，0，max ，V ^p _s，0，min }

wherein, V ^p _s，0，val Voltage sampling value V of the S & ltth & gt converter station bus needing to be monitored at the T0 th moment ^p _s，0，max The bus bar of the converter station to be monitored for the s-th bar is at the Tth ₀ Upper voltage limit at time, V ^p _s，0，min The bus bar of the converter station to be monitored for the s-th bar is at the T-th ₀ The lower limit of the voltage at the time.

(2-2-2) setting the s-th new energy power plant high-voltage side bus needing to be monitored at the T-th ₀ Voltage information of time is V _s，0，h The composition is as follows:

V _s，0，h ＝{V ^h _s，0，val ，V ^h _s，0，max ，V ^h _s，0，min }

wherein, V ^h _s，0，val The high-voltage side bus of the new energy power plant needing to be monitored for the s-th bus is arranged at the T-th bus ₀ Value of the voltage sample at a time, V ^h _s，0，max The high-voltage side bus of the new energy power plant needing to be monitored for the s-th bus is arranged at the T-th bus ₀ Upper voltage limit at time, V ^h _s，0，min The high-voltage side bus of the new energy power plant needing to be monitored for the s-th bus is arranged at the T-th bus ₀ The lower limit of the voltage at the time.

(2-3) setting the sequence numbers of new energy power plant units in the new energy direct current transmission end power grid to be G, G = G \8230; G, G represent the total number of new energy power plant units in a new energy direct current transmission end power grid model M, and Gen represents _0，p And Gen _0，q For new energy power plant unit at Tth ₀ The initial active and initial reactive at the moment.

Gen ₀ ＝[g，g＝1，..G]{Gen _g，0，p ，Gen _g，0，q }

Wherein, gen _g，0，p And Gen _g，0，q The g-th new energy power plant unit is at the T ₀ Real and reactive information of the moment.

(2-3-1) active information Gen of the unit of the g-th new energy power plant at the T0 th moment _g ，0， _p The composition is as follows:

Gen _g，0，p ＝{Gen ^p _g，0，val ，Gen ^p _g，0，max ，Gen ^p _g，0，min }

wherein, gen ^P _g，0，val For the g new energy power plant unit at the T ₀ Active sampled value of time, gen ^p _g，0，max For the g new energy power plant unit at the T ₀ Active upper limit of time, gen ^P _g，0，min For the g new energy power plant unit at the T ₀ The real power lower limit value of the moment.

(2-3-2) active information Gen of the unit of the g-th new energy power plant at the T0 th moment _g，0，q The composition is as follows:

Gen _g，0，q ＝{Gen ^q _g，0，val ，Gen ^q _g，0，max ，Gen ^q _g，0，min }

wherein, gen ^q _g，0，val A reactive sampling value Gen of the unit of the g-th new energy power plant at the T0 th moment ^q _g，0，max For the g new energy power plant unit at the T ₀ Reactive upper limit at time, gen ^q _g，0，min For the g new energy power plant unit at the Tth ₀ And a reactive lower limit value of the moment.

(2-4) setting the serial numbers of the new energy power plant units in the new energy direct current transmission end power grid to be G, G = G \8230; G and 8230, wherein G represent the total number of the new energy power plant units in a new energy direct current transmission end power grid model M, and Sen _0，lq And Sen _0，hv And Sen _0，pv Are new energy power plant units in the Tth ₀ Sensitivity to outgoing line reactive power of new energy power plant, sensitivity to high-voltage side bus voltage of new energy power plant and commutation current at any timeSensitivity of station bus voltage.

Sen ₀ ＝[g，g＝1，..G]{Sen _g，0，lq ，Sen _g，0，hv ，Sen _g，0，pv }

Wherein, sen _g，0，lq ，Sen _g，0，hv ，Sen _g，0，pv The g-th new energy power plant unit is at the T ₀ And the new energy power plant outgoing line reactive power sensitivity, the new energy power plant high-voltage side bus voltage sensitivity and the converter station bus voltage sensitivity correspond to each moment.

(2-4-1) setting the reactive power adjustment quantity of the unit of the g-th new energy power plant at the T0 moment to be delta Q _g，0 Then the following relationship is satisfied:

ΔQ _l，0 ＝Sen _g，0，lq *ΔQ _g，0 (2.1)

ΔV ^h _s，0 ＝Sen _g，0，hv *ΔQ _g，0 (2.2)

ΔV ^p _s，0 ＝Sen _g，0，pv *ΔQ _g，0 (2.3)

wherein, is Δ Q _l，0 Is T ₀ The reactive power adjustment quantity of the g-th new energy source unit at the moment is delta Q _g，0 In time, the reactive power variation of the outgoing line of the first new energy power plant; Δ V ^h _s，0 Is T ₀ Reactive power adjustment delta Q of the g-th new energy source unit at moment _g，0 In the process, the voltage variation of the high-voltage side bus of the new energy power plant to be monitored is the s th; Δ V ^p _s，0 Is T ₀ Reactive power regulation delta Q of the g-th new energy unit at moment _g，0 And the voltage variation of the bus of the converter station to be monitored in the s-th line.

Further, in order to facilitate understanding of a new energy dc transmitting end power grid ac islanding mode and a new energy dc transmitting end power grid ac networking mode, as shown in fig. 2, fig. 2 is a schematic diagram of a new energy dc transmitting end power grid ac islanding mode provided in an embodiment of the present disclosure; as shown in fig. 3, fig. 3 is a schematic diagram of an ac networking mode of a new energy dc transmission grid according to an embodiment of the present disclosure.

In an embodiment of the present disclosure, the determining, according to a power grid model topological relation of a converter station, an operation mode of the new energy direct current transmission end power grid includes:

Further, in an embodiment of the present disclosure, the method further includes:

Setting the automatic voltage control mode of the new energy direct current transmission end power grid to Strg _m ；

Strg _m ＝{Strg _u ，Strg _q }

Wherein, strg _u For variable voltage control mode, strg _a The control mode is a constant voltage control mode.

The corresponding relation between the operation mode of the new energy direct current transmission end power grid and the automatic voltage control mode is as follows:

when the operation mode of the new energy direct current transmission end power grid converter station is alternating current networking:

Strg _m ＝[Strg _u ]{M _d ＝M _nom }

when the operation mode of the new energy direct current transmission end power grid converter station is an alternating current isolated island:

Strg _m ＝[Strg _q ]{M _d ＝M _isd }

further, in this disclosure, when it is determined that the operation mode of the new energy dc transmission end power grid is the variable voltage control mode, calculating the reactive power adjustment amount corresponding to each power plant unit in the dc transmission end power grid according to the initial section data and the operation mode includes:

obtaining the bus voltage information V of the converter station at the T0 th moment _s，0，p Reactive voltage sensitivity information Sen of new energy power plant unit ₀ Optimal target set value of central bus voltage of converter station

Respectively inputting a first minimum objective function to obtain a reactive power adjustment quantity delta Q of the new energy power plant unit _g，0 。

(3) Is set at the T-th ₀ The operation mode of the new energy direct current sending end power grid at any moment is M _d ＝M _nom The automatic voltage control method for this operating mode (ac networking mode) is as follows:

(3-1) the automatic voltage control mode in the current operation mode is a variable voltage control mode, namely:

Strg _m ＝[Strg _u ]

at the moment, the new energy direct current transmission end power grid needs to realize voltage control integrally coordinated with a superior power grid, on one hand, the voltage regulation and control target of each plant station should be coordinated and matched with the voltage of the superior power grid, and the voltage safety operation requirement of new energy grid connection in the alternating current area of the new energy direct current transmission end power grid is met; on the other hand, the reactive power reasonable flow of a new energy direct current transmission end power grid area and an upper and lower power grid is realized by considering the regulation and matching with the reactive power resource of the upper power grid.

Therefore, the aim of the automatic voltage control strategy of the new energy direct current transmission end power grid is to achieve the aim of voltage coordination with a superior power grid and whole-grid reactive power optimization by adjusting the voltage of a central bus of the converter station and the voltage of a high-voltage side control bus of the new energy power plant.

(3-2) under the AC networking mode, the reactive power output of a new energy power plant unit is changed through an automatic voltage control strategy by the new energy direct current sending end power grid, the voltage of a high-voltage side control bus of the new energy power plant and the voltage of a central bus of a converter station are adjusted, and the voltage of the central bus of the converter station is enabled to be as close as possible to an optimized voltage set value given by a superior power grid

Therefore, an objective function which takes the central bus voltage of the converter station as an optimization objective and adopts a quadratic programming model can be constructed:

wherein, is Δ Q _g The unit reactive adjustment quantity of the new energy power plant is an optimization variable of the function; v ^p _s，val Representing a current value of a neutral bus voltage of the converter station;

the method comprises the steps that an optimized set value of the central bus voltage of the converter station is represented, and the value is given by the global reactive power optimization of a superior power grid; sen _g，pv Sensitivity of unit reactive power to converter station bus voltage is obtained; theta.theta. _g The reactive power balance index of the unit is obtained; w _p And W _q Two weight coefficients for the function.

θ _g As the reactive power balance index of the unit, the meaning is as follows:

wherein, gen ^q _g，val 、Gen ^q _g，max And Gen ^q _g，min And respectively representing the current reactive power, the upper reactive power limit and the lower reactive power limit of the new energy power plant unit.

Minimizing the first part of the objective function by Δ Q _g Adjusting the reactive power output of the new energy power plant unit to ensure that the bus voltage V of the converter station ^p _s，val As close as possible to the optimum target value

The second part will | | θ _g || ² The reactive power regulation margin of the new energy power plant unit is ensured to be increased by introducing the reactive power regulation margin into the objective function, and the reactive power output of each new energy power plant unit in the area is promoted to be developed in a more balanced direction, so that the optimization objective is achieved

Meanwhile, the balance of reactive power output of each new energy power plant is ensured as much as possible.

(3-3) at the T ₀ At any moment, obtaining converter station bus voltage information V according to the step (2-2) _s，0，p Obtaining reactive voltage sensitivity information Sen of the new energy power plant unit according to the step (2-4) ₀ Obtaining an optimized target set value of the central bus voltage of the converter station according to the step (3-2)

Substituting the above data into the minimized objective function of step (3-2) yields:

solving the quadratic programming problem through a function set algorithm to obtain the reactive power adjustment quantity delta Q of the new energy power plant unit _g，0 。

Further, in this disclosed embodiment, the adjusting the parameter of the new energy dc transmission end power grid according to the reactive power adjustment amount of the new energy power plant unit includes:

according to the reactive power adjustment quantity delta Q of the new energy power plant unit _g，0 And the reactive sensitivity information Sen of the new energy power plant unit ₀ Calculating to obtain the voltage of a high-voltage side bus of a new energy power plantAdjustment quantity Δ V ^h _s，0 ；

According to the adjustment quantity delta V of the high-voltage side bus voltage of the new energy power plant ^h _s，0 And the reactive sensitivity information Sen of the new energy power plant unit ₀ For new energy power plant unit at Tth ₀ Updating the initial reactive power at the moment;

according to the latest new energy DC transmitting end power grid initial data section F _m，0 Can obtain the updated data section F of the new energy direct current transmission end power grid _m，1 ，F _m，1 As the T th ₀ And the data section of the new energy direct current transmission end power grid at the moment +1 provides data support for the next round of automatic voltage control, and the automatic voltage control function of the new energy direct current transmission end power grid in the alternating current networking mode is realized.

(3-4) obtaining the reactive power adjustment quantity delta Q of the new energy power plant unit according to the step (3-3) _g，0 And (5) utilizing the reactive sensitivity information Sen of the new energy power plant unit in the step (2-4) ₀ Obtaining the adjustment quantity delta V of the high-voltage side bus voltage of the new energy power plant ^h _s，0 ：

ΔV ^h _s，0 ＝Sen _g，0，hv *ΔQ _g，0

Adjusting quantity delta V of high-voltage side bus voltage of new energy power plant by main station ^h _s，0 And the control strategy is issued to the new energy power plant substation system, and the final control execution is completed by the new energy power plant substation system.

(3-5) adjusting quantity delta V of voltage of high-voltage side bus of the new energy power plant obtained by the new energy power plant substation system according to the step (3-4) ^h _s，0 And (5) utilizing the reactive sensitivity information Sen of the new energy power plant unit in the step (2-4) ₀ And obtaining the reactive adjustment quantity delta Q of the new energy power plant unit by conversion _g，0 . Using Δ Q _g，0 Updating the new energy power plant unit information Gen in the step (2-3) ₀ To obtain Gen' ₀ ：

Gen′ ₀ ＝[g，g＝1，..G]{Gen _g，0，p ，Gen′ _g，0，q }

Wherein, gen' _g，0，q Is at the firstReactive power of unit of g-th new energy power plant at T0 time is according to delta Q _g And 0 adjusted information.

According to the step (2-3-2):

Gen′ _g，0，q ＝{(Genq _g，0，val +ΔQ _g，0 )，Gen ^q _g，0，max ，Gen ^q _g，0，min }

(3-6) obtaining the reactive power adjustment quantity delta Q of the new energy power plant unit according to the step (3-5) _g，0 And (2-4) new energy power plant unit reactive power sensitivity information Sen ₀ And (3) updating the reactive information of the outgoing line of the new energy power plant in the step (2-1), the voltage of the high-voltage side bus of the new energy power plant in the step (2-2) and the voltage information of the bus of the converter station.

(3-6-1) updating the new energy power plant outlet reactive power information Ln in the step (2-1) _0，q To obtain Ln' _0，q ：

Ln′ _0，q ＝[l，l＝1，..L]{Q′ _0，l }

Wherein, Q' _0，l Is the T th ₀ The reactive power of the outgoing line of the first new energy power plant at any moment is according to delta Q _g，0 And adjusting the information of the unit after the reactive power output.

Q′ _0，l ＝Q _0，l +ΔQ _l，0

Wherein Q _0，l Is the T th ₀ Initial reactive power information delta Q of outgoing line of the first new energy power plant at moment _l，0 And adjusting the reactive power of the outgoing line of the new energy power plant.

According to the step (2-4-1), the reactive power adjustment quantity delta Q of the outgoing line of the new energy power plant can be known _l，0 And the reactive adjustment quantity delta Q of the new energy power plant unit _g，0 The relationship of (1) is:

ΔQ _l，0 ＝Sen _g，0，lq *ΔQ _g，0

(3-6-2) updating the voltage information V of the high-voltage side bus of the new energy power plant in the step (2-2) _s，0，h To obtain V' _s，0，h ：

V′ _s，0，h ＝{V ^h′ _s，0，val ，V ^h _s，0，max ，V ^h _s，0，min }

Wherein, V ^h′ _s，0，val Is the T th ₀ The voltage of the high-voltage side bus of the new energy power plant needing to be monitored at the time of the s th time is according to delta Q _g，0 And adjusting the information of the unit after the reactive power output.

V ^h′ _s，0，val ＝V ^h _s，0，val +ΔV ^h _s，0

Wherein, V ^h _s，0，val Is the T th ₀ At the time s, initial information of the voltage of the high-voltage side bus of the new energy power plant needing to be monitored, namely delta V ^h _s，0 The voltage adjustment quantity of the high-voltage side bus of the new energy power plant is obtained.

According to the step (2-4-1), the voltage adjustment quantity delta V of the high-voltage side bus of the new energy power plant can be known ^h _s，0 And the reactive adjustment quantity delta Q of the new energy power plant unit _g，0 The relationship of (1) is:

ΔV ^h _s，0 ＝Sen _g，0，hv *ΔQ _g，0

(3-6-3) updating the converter station bus voltage information V in the step (2-2) _s，0，p To obtain V' _s，0，p ：

V′ _s，0，p ＝{V ^p′ _s，0，val ，V ^p _s，0，max ，V ^p _s，0，min }

Wherein, V ^p′ _s，0，val Is the T th ₀ The bus voltage of the converter station to be monitored according to delta Q at the time of the s-th _g，0 And adjusting the information of the unit after the reactive power output.

V ^p′ _s，0，val ＝V ^p _s，0，val +ΔV ^p _s，0

Wherein, V ^p _s，0，val Is the T th ₀ Initial information of bus voltage of converter station to be monitored, delta V, at the time of s ^p _s，0 The amount of voltage adjustment for the bus bars of the converter station.

According to the step (2-4-1), the voltage adjustment quantity delta V of the bus of the converter station can be known ^p _s，0 And new energy power plant unitReactive power adjustment quantity delta Q _g，0 The relationship of (1) is:

ΔV ^p _s，0 ＝Sen _g，0，pv *ΔQ _g，0

(3-7) adjusting the initial data section F of the new energy direct current transmission end power grid through the step (3-6) _m，0 Can obtain the updated data section F of the new energy direct current transmission end power grid _m，1 ，F _m，1 As the T th ₀ And the data section of the new energy direct current transmission end power grid at the moment +1 provides data support for the next round of automatic voltage control.

F _m，1 ＝{Ln _1，p ，Ln _1，q ，Bs ₁ ，Gen ₁ ，Sen ₁ }

(3-8) at the T ₀ At the moment +1, obtaining a new energy direct current transmission end power grid data section F according to the step (3-7) _m，1 Repeating the processes of the steps (3-3) - (3-7) to perform the Tth step ₀ The automatic voltage control calculation of the +1 moment is carried out, and a data section F of the next moment is obtained _m，2 。

And (3-9) the reference steps (3-8) are sequentially circulated, so that the automatic voltage control function of the new energy direct current transmission end power grid in the alternating current networking mode is realized.

Further, in this disclosure, when it is determined that the operation mode of the new energy dc transmission end power grid is the constant voltage control mode, the adjusting the parameter of the new energy dc transmission end power grid according to the reactive power adjustment amount of the new energy power plant unit includes:

acquiring initial reactive power information Gen of new energy power plant unit _0，q Reactive voltage sensitivity information Sen of new energy power plant unit ₀ At the T-th ₀ Initial reactive power accumulation Gate of moment _0，q ；

The initial reactive power information Gen of the new energy power plant unit _0，q Reactive voltage sensitivity information Sen of new energy power plant unit ₀ At the T-th ₀ Initial reactive power accumulation Gate of moment _0，q Inputting a second minimum objective function to obtain the reactive power adjustment quantity delta Q of the new energy power plant unit _g，0 。

Setting upThe operation mode of the new energy direct current transmission end power grid at the T0 time is M _d ＝M _isd The automatic voltage control method according to this operation mode (ac island mode) is as follows:

(4-1) the automatic voltage control mode in the current operation mode is a constant voltage control mode, namely:

Strg _m ＝[Strg _q ]

at the moment, the new energy direct current sending end power grid adopts a constant-voltage control strategy for a bus in the converter station, and when the voltage of the bus in the converter station fluctuates due to active intermittent fluctuation in a new energy region, a control system in the converter station can quickly respond and keep the voltage of the bus in the converter station constant by adjusting reactive power output of a flexible direct current system.

Therefore, the aim of the automatic voltage control strategy of the new energy direct current transmission end power grid is to fully exert the reactive power regulation capacity of the new energy power plant, provide reactive power compensation for new energy power generation and output, reduce reactive power support of a converter station flexible direct current system and improve dynamic reactive power margin of the converter station flexible direct current system.

(4-2) setting a reactive power exchange gateway of the new energy power plant and the new energy direct current transmission end converter station as Gate _m And the gateway comprises outlet lines of all new energy power plants connected into the converter station.

At the T th ₀ Time reactive power exchange gateway Gate _m The sampling value of the reactive power is Gate _0，q According to the step (2-1), it can be seen that:

wherein, the Gate _0，q And performing initial reactive power accumulation for the outgoing line of the new energy power plant connected into the converter station at the T0 th moment.

And (4-3) according to the step (4-1), the aim of the automatic voltage control strategy of the new energy direct current transmission end power grid is to provide reactive compensation for the new energy power plant by means of self regulation capacity so as to improve reactive reserve of a converter station flexible direct current system. Namely: by adjusting the reactive output of the new energy power plant unit, the reactive interaction between the new energy power plant and the converter station is reduced as much as possible.

For this purpose, a Gate may be constructed with converter station gates _m The reactive power of (2) is an optimization target, and an objective function of a quadratic programming model is adopted:

wherein, is Δ Q _g The unit reactive adjustment quantity of the new energy power plant is an optimization variable of the function; gate _q Indicating that the gateway of the converter station is currently idle; gate ^set _q The target value is a set value of a gateway reactive power control target, the target value is generally 0, and the target value can also be updated in real time according to the operation mode of a new energy direct current transmission end power grid; sen _g，lq Sensitivity of the unit reactive power mentioned in the step (2-4) to the line; theta _g The reactive power balance index of the unit is obtained; w _p And W _q Two weight coefficients for the function.

wherein, gen ^q _g，val 、Gen ^q _g，max And Gen ^q _g，min Respectively representing the current reactive power, the upper reactive power limit and the lower reactive power limit of the new energy power plant unit.

Minimizing the first part of the objective function by Δ Q _g Adjusting the reactive power output of the new energy power plant unit to ensure that the converter station gateway has a reactive Gate _q As close as possible to the target value Gate ^set _q . The second part will | | θ _g || ² The reactive power control method is introduced into an objective function, on one hand, the reactive power regulation margin of the new energy power plant unit is ensured to be increased, on the other hand, the reactive power output of each new energy power plant unit in the area is promoted to be developed in a more balanced direction, and the control goal of reaching the Gate is reflected ^set _q Meanwhile, the balance of reactive power output of each new energy power plant is ensured as much as possible.

(4-4) at the T ₀ And (6) obtaining reactive information Gen of the new energy power plant unit according to the step (2-3) _0，q Obtaining the reactive voltage sensitivity information Sen of the new energy power plant unit according to the step (2-4) ₀ Obtaining the reactive Gate of the gateway of the converter station according to the step (4-2) _0，q And (4) substituting the data into the minimized objective function of the step (4-3) to obtain:

solving the quadratic programming problem through a function set algorithm to obtain the reactive power adjustment quantity delta Q of the new energy power plant unit _g，0 And the master station adjusts the reactive power adjustment quantity delta Q of the new energy power plant unit _g，0 And the control strategy is issued to the new energy power plant substation system, and the final control execution is completed by the new energy power plant substation system.

according to the reactive power adjustment quantity delta Q of the new energy power plant unit _g，0 To and new energy power plant unit reactive sensitivity information Sen ₀ For new energy power plant unit at Tth ₀ Updating the initial reactive power at the moment, the voltage of the high-voltage side bus and the voltage information of the converter station bus;

by adjusting the initial data section F of the new energy direct current transmission end power grid _m，0 Obtaining updated data section F of new energy direct current transmission end power grid _m，1 ，F _m，1 As the T th ₀ And the data section of the new energy direct current transmission end power grid at the moment +1 provides data support for the next round of automatic voltage control, and the automatic voltage control function of the new energy direct current transmission end power grid in an island mode is realized.

(4-5) the new energy power plant substation system obtains the new energy power plant unit reactive power adjustment quantity delta Q according to the step (4-4) _g，0 And (4) updating the new energy power plant unit information Gen in the step (2-3) ₀ To obtain Gen' ₀ ：

Gen′ ₀ ＝[g，g＝1，..G]{Gen _g，0，p ，Gen′ _g，0，q }

Wherein, gen' _g，0，q Is at the T th ₀ No-load delta Q of unit of the g-th new energy power plant at any moment _g，0 The adjusted information.

According to the step (2-3-2):

Gen′ _g，0，q ＝{(Gen ^q _g，0，val +ΔQ _g，0 )，Gen ^q _g，0，max ，Genq _g，0，min }

(4-6) obtaining the reactive power adjustment quantity delta Q of the new energy power plant unit according to the step (4-4) _g，0 And (2-4) new energy power plant unit reactive sensitivity information Sen ₀ And (3) updating the reactive information of the outgoing line of the new energy power plant in the step (2-1), the voltage of the high-voltage side bus of the new energy power plant in the step (2-2) and the voltage information of the bus of the converter station.

(4-6-1) updating the new energy power plant outlet reactive power information Ln in the step (2-1) _0，q To obtain Ln' _0，q ：

Ln′ _0，q ＝[l，l＝1，..L]{Q′ _0，l }

Wherein, Q' _0，l Is the T th ₀ The reactive power of the outgoing line of the first new energy power plant at any moment is according to delta Q _g，0 The adjusted information.

Q′ _0，l ＝Q _0，l +ΔQ _l，0

Wherein Q is _0，l Is the T th ₀ Initial reactive power information delta Q of outgoing line of the first new energy power plant at moment _l，0 And adjusting the reactive power of the outgoing line of the new energy power plant.

ΔQ _l，0 ＝Sen _g，0，lq *ΔQ _g，0

(4-6-2) updating the voltage information V of the high-voltage side bus of the new energy power plant in the step (2-2) _s，0，h To obtain V' _s，0，h ：

Wherein, V ^h′ _s，0，val Is the T th ₀ The voltage of the high-voltage side bus of the new energy power plant needing to be monitored at the time of the s th time is according to delta Q _g，0 The adjusted information.

V ^h′ _s，0，val ＝V ^h _s，0，val +ΔV ^h _s，0

Wherein, V ^h _s，0，val Is the T th ₀ The initial information of the voltage of the high-voltage side bus of the new energy power plant needing to be monitored, delta V, at the time of s ^h _s，0 The voltage adjustment quantity of the high-voltage side bus of the new energy power plant is obtained.

According to the step (2-4-1), the voltage adjustment quantity delta V of the high-voltage side bus of the new energy power plant can be known ^h _s，0 And the reactive power adjustment quantity delta Q of the new energy power plant unit _g，0 The relationship of (1) is:

ΔV ^h _s，0 ＝Sen _g，0，hv *ΔQ _g，0

(4-6-3) updating the converter station bus voltage information V in the step (2-2) _s，0，p To give V' _s，0，p ：

Wherein, V ^p′ _s，0，val Is the T th ₀ The bus voltage of the converter station to be monitored according to delta Q at the time of the s-th _g，0 The adjusted information.

V ^p′ _s，0，val ＝V ^p _s，0，val +ΔV ^p _s，0

Wherein, V ^p _s，0，val Is the T th ₀ Initial information of bus voltage of converter station to be monitored, delta V, at the time of s ^p _s，0 For current conversionAnd adjusting the voltage of the station bus.

According to the step (2-4-1), the voltage adjustment quantity delta V of the bus of the converter station can be known ^p _s，0 And the reactive adjustment quantity delta Q of the new energy power plant unit _g，0 The relationship of (1) is:

ΔV ^p _s，0 ＝Sen _g，0，pv *ΔQ _g，0

(4-7) adjusting the initial data section F of the new energy direct current transmission end power grid through the step (4-6) _m，0 Can obtain the updated data section F of the new energy direct current transmission end power grid _m，1 ，F _m，1 As the T th ₀ And the data section of the new energy direct current transmission end power grid at the moment +1 provides data support for the next round of automatic voltage control.

F _m，1 ＝{Ln _1，p ，Ln _1，q ，Bs ₁ ，Gen ₁ ，Sen ₁ }

(4-8) at the T ₀ At the moment +1, according to the new energy direct current transmission end power grid data section F obtained in the step (4-7) _m，1 And (4) repeating the processes of the steps (4-4) to (4-7), performing automatic voltage control calculation at the T0+1 th moment, and obtaining a data section F at the next moment _m，2 。

And (4-9) the reference steps (4-8) are sequentially circulated, so that the automatic voltage control function of the new energy direct current transmission end power grid in an island mode is realized.

will T ₁ And taking the data section of the new energy direct current transmission end power grid at the moment as an initial data section of the T1 period to perform automatic voltage control of the next period.

In an actual automatic voltage control system of a new energy direct current transmission end power grid, the system controls a period T with automatic voltage _c And periodically checking the power grid model topological state of the new energy direct current transmission end power grid converter station as a unit.

Setting new energyThe automatic voltage control period of the power grid at the source direct current transmission end is T _c 。

When the operation mode of the new energy direct current transmission end power grid is an alternating current networking mode, the automatic voltage control system of the new energy direct current transmission end power grid can be automatically switched to the alternating current networking mode M _nom After a period T of automatic voltage control _c And (4) carrying out reactive voltage control on the new energy direct current transmission end power grid according to the method in the step (3).

When the operation mode of the new energy direct current sending end power grid is an alternating current island mode, the automatic voltage control system of the new energy direct current sending end power grid can be automatically switched to an alternating current island mode M _isd After a period of automatic voltage control T _c And (5) carrying out reactive voltage control on the new energy direct current transmission end power grid according to the method in the step (4).

In conclusion, the reactive voltage control function of automatic switching between the alternating current networking mode and the island mode in the new energy direct current transmission end power grid is realized.

Corresponding to the method for controlling the reactive voltage in the direct current transmission end power grid, the invention also provides a device for controlling the reactive voltage in the direct current transmission end power grid. Since the device embodiment of the present invention corresponds to the method embodiment described above, details that are not disclosed in the device embodiment may refer to the method embodiment described above, and are not described again in the present invention.

Fig. 4 is a schematic structural diagram of a device for controlling reactive voltage in a dc link power grid according to an embodiment of the present disclosure, as shown in fig. 4, including: a reading unit 51, a determination unit 52, a calculation unit 53, and an adjustment unit 54.

The reading unit 51 is used for reading an initial data section of a new energy direct current transmission end power grid;

the judging unit 52 is configured to judge an operation mode of the new energy direct current transmission end power grid according to a power grid model topological relation of the converter station;

the calculating unit 53 is configured to calculate reactive power adjustment amounts corresponding to power plant units in the direct current transmission end power grid according to the initial section data and the operation mode;

and the adjusting unit 54 is used for adjusting the parameters of the new energy direct current transmission end power grid according to the reactive power adjustment quantity of the new energy power plant unit.

Further, in the embodiment of the present disclosure, the reading unit 51 is further configured to:

reading a corresponding initial data section from the new energy direct current transmission end power grid model M according to a preset clock;

Further, in the embodiment of the present disclosure, as shown in fig. 5, the determination unit 52 includes:

the first determining module 521 is configured to determine that an operation mode of a new energy direct current transmission end power grid is an alternating current island mode if an electrical connection relationship exists between an online collection bus of a new energy power plant in a converter station and a direct current system of the converter station and the electrical connection relationship is disconnected with a main transformer of the converter station;

the second determining module 522 is configured to determine that the operation mode of the new energy direct current transmission end power grid is an alternating current networking mode if an electrical connection relationship exists between the new energy power plant online collection bus in the converter station and a main transformer of the converter station and the electrical connection relationship is disconnected with a direct current system of the converter station.

Further, in the embodiment of the present disclosure, as shown in fig. 5, the determining unit 52 further includes:

a first setting module 523, configured to set an automatic voltage control mode of the ac isolated island mode to a constant voltage control mode;

a second setting module 524, configured to set an automatic voltage control mode of the ac networking mode to a variable voltage control mode.

Further, in this embodiment of the disclosure, as shown in fig. 5, when it is determined that the operation mode of the new energy dc transmission-side power grid is the variable voltage control mode, the calculating unit 53 includes:

a first obtaining module 531 for obtaining the Tth ₀ Bus voltage information V of converter station at moment _s，0，p Reactive voltage sensitivity information Sen of new energy power plant unit ₀ Optimal target set value of central bus voltage of converter station

A first input module 532 for inputting said converter station bus voltage information V _s，0，p Reactive voltage sensitivity information Sen of new energy power plant unit ₀ Optimal target set value of central bus voltage of converter station

Respectively inputting the first minimum objective function to obtain the reactive power adjustment quantity delta Q of the new energy power plant unit _g，0 。

Further, in the embodiment of the present disclosure, as shown in fig. 5, the adjusting unit 54 includes:

a calculating module 541, configured to calculate a reactive adjustment Δ Q of the new energy power plant unit according to the new energy power plant unit _g，0 And the reactive sensitivity information Sen of the new energy power plant unit ₀ And calculating to obtain the adjustment quantity delta V of the voltage of the high-voltage side bus of the new energy power plant ^h _s，0 ；

A first updating module 542 configured to adjust an adjustment amount Δ V of a high-voltage side bus voltage of the new energy power plant according to the new energy power plant ^h _s，0 And the reactive sensitivity information Sen of the new energy power plant unit ₀ For new energy power plant unit at the T ₀ Updating the initial reactive power at the moment;

a first circulation module 543, configured to send an initial data section F of the grid according to the latest new energy dc transmission end _m，0 Can obtain the updated data section F of the new energy direct current transmission end power grid _m，1 ，F _m，1 As the T th ₀ And the data section of the new energy direct current transmission end power grid at the moment +1 provides data support for the next round of automatic voltage control, and the automatic voltage control function of the new energy direct current transmission end power grid in the alternating current networking mode is realized.

Further, in this embodiment of the disclosure, as shown in fig. 5, when it is determined that the operation mode of the new energy dc transmission-side power grid is the constant voltage control mode, the calculating unit 53 includes:

a second obtaining module 533, configured to obtain initial reactive information Gen of the new energy power plant unit _0，q Reactive voltage sensitivity information Sen of new energy power plant unit ₀ At the T-th ₀ Initial reactive power accumulation Gate of moment _0，q ；

A second input module 534, configured to input the initial reactive information Gen of the new energy power plant unit _0，q Reactive voltage sensitivity information Sen of new energy power plant unit ₀ At the T-th ₀ Initial reactive power accumulation Gate of moment _0，q Inputting a second minimum objective function to obtain a reactive adjustment quantity delta Q of the new energy power plant unit _g，0 。

a second updating module 544, configured to update the reactive power adjustment Δ Q according to the reactive power adjustment Δ Q of the new energy power plant unit _g，0 To and new energy power plant unit reactive sensitivity information Sen ₀ For new energy power plant unit at the T ₀ Updating the initial reactive power at the moment, the voltage of the high-voltage side bus and the voltage information of the converter station bus;

a second circulation module 545 for adjusting the initial data section F of the new energy direct current transmission end power grid _m，0 Obtaining updated data section F of the new energy direct current transmission end power grid _m，1 ，F _m，1 As the T th ₀ And the data section of the new energy direct current transmission end power grid at the moment +1 provides data support for the next round of automatic voltage control, and the automatic voltage control function of the new energy direct current transmission end power grid in an island mode is realized.

Further, in the embodiment of the present disclosure, as shown in fig. 5, the apparatus further includes:

a checking unit 55 for checking the control period T _c As a unit, periodically checking the topological state of a power grid model of a new energy direct current transmission end power grid converter station;

a circulation unit 56 for circulating T ₁ The data section of the new energy direct current transmission end power grid at the moment is used as T ₁ The initial data section of the cycle is subject to automatic voltage control for the next cycle.

It should be noted that the foregoing explanation of the method embodiment is also applicable to the apparatus of the present embodiment, and the principle is the same, and the present embodiment is not limited thereto.

The present disclosure also provides an electronic device, a readable storage medium, and a computer program product according to embodiments of the present disclosure.

FIG. 6 illustrates a schematic block diagram of an example electronic device 600 that can be used to implement embodiments of the present disclosure. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be examples only, and are not meant to limit implementations of the disclosure described and/or claimed herein.

As shown in fig. 6, the device 600 includes a computing unit 601 that can perform various appropriate actions and processes according to a computer program stored in a ROM (Read-Only Memory) 602 or a computer program loaded from a storage unit 608 into a RAM (Random Access Memory) 603. In the RAM 603, various programs and data required for the operation of the device 600 can also be stored. The calculation unit 601, the ROM 602, and the RAM 603 are connected to each other via a bus 604. An I/O (Input/Output) interface 605 is also connected to the bus 604.

A number of components in the device 600 are connected to the I/O interface 605, including: an input unit 606 such as a keyboard, a mouse, or the like; an output unit 607 such as various types of displays, speakers, and the like; a storage unit 608, such as a magnetic disk, optical disk, or the like; and a communication unit 609 such as a network card, modem, wireless communication transceiver, etc. The communication unit 609 allows the device 600 to exchange information/data with other devices via a computer network such as the internet and/or various telecommunication networks.

The computing unit 601 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of the computing Unit 601 include, but are not limited to, a CPU (Central Processing Unit), a GPU (graphics Processing Unit), various dedicated AI (Artificial Intelligence) computing chips, various computing Units running machine learning model algorithms, a DSP (Digital Signal Processor), and any suitable Processor, controller, microcontroller, and the like. The calculation unit 601 performs the various methods and processes described above, such as the method of reactive voltage control in a dc-fed grid. For example, in some embodiments, the method of reactive voltage control in a dc link grid may be implemented as a computer software program tangibly embodied in a machine-readable medium, such as storage unit 608. In some embodiments, part or all of the computer program may be loaded and/or installed onto the device 600 via the ROM 602 and/or the communication unit 609. When the computer program is loaded into the RAM 603 and executed by the computing unit 601, one or more steps of the method described above may be performed. Alternatively, in other embodiments, the calculation unit 601 may be configured by any other suitable means (e.g. by means of firmware) to perform the aforementioned method of reactive voltage control in a dc-side grid.

Various implementations of the systems and techniques described here above may be realized in digital electronic circuitry, integrated circuitry, FPGAs (Field Programmable Gate arrays), ASICs (Application-Specific Integrated circuits), ASSPs (Application Specific Standard products), SOCs (System On Chip, system On a Chip), CPLDs (Complex Programmable Logic devices), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.

Program code for implementing the methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowchart and/or block diagram to be performed. The program code may execute entirely on the machine, partly on the machine, as a stand-alone software package partly on the machine and partly on a remote machine or entirely on the remote machine or server.

In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a RAM, a ROM, an EPROM (Electrically Programmable Read-Only-Memory) or flash Memory, an optical fiber, a CD-ROM (Compact Disc Read-Only-Memory), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having: a Display device (e.g., a CRT (Cathode Ray Tube) or LCD (liquid crystal Display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user may provide input to the computer. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic, speech, or tactile input.

The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: LAN (Local Area Network), WAN (Wide Area Network), internet, and blockchain Network.

The computer system may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The Server can be a cloud Server, also called a cloud computing Server or a cloud host, and is a host product in a cloud computing service system, so as to solve the defects of high management difficulty and weak service expansibility in the traditional physical host and VPS service ("Virtual Private Server", or simply "VPS"). The server may also be a server of a distributed system, or a server incorporating a blockchain.

It should be noted that artificial intelligence is a subject for studying a computer to simulate some human thinking processes and intelligent behaviors (such as learning, reasoning, thinking, planning, etc.), and includes both hardware and software technologies. Artificial intelligence hardware technologies generally include technologies such as sensors, dedicated artificial intelligence chips, cloud computing, distributed storage, big data processing, and the like; the artificial intelligence software technology mainly comprises a computer vision technology, a voice recognition technology, a natural language processing technology, a machine learning/deep learning technology, a big data processing technology, a knowledge map technology and the like.

It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present disclosure may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved.

The above detailed description should not be construed as limiting the scope of the disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. A method for controlling reactive voltage in a direct current transmission end power grid is characterized by comprising the following steps:

judging the operation mode of the new energy direct current transmission end power grid according to the power grid model topological relation of the converter station; calculating reactive power adjustment quantities corresponding to all power plant units in the direct current transmission end power grid respectively according to the initial section data and the operation mode;

2. The method according to claim 1, wherein the reading of the initial profile data of the new energy delivery side power grid comprises:

3. The method according to claim 2, wherein the determining the operation mode of the new energy direct current transmission end power grid according to the power grid model topological relation of the converter station comprises:

if an electrical connection relationship exists between a new energy power plant on-line collection bus in a converter station and a direct current system of the converter station and the electrical connection relationship is disconnected with a main transformer of the converter station, determining that the operation mode of a new energy direct current transmission end power grid is an alternating current island mode;

4. The method of claim 3, further comprising:

5. The method according to claim 3, wherein when the operation mode of the new energy direct current transmission end power grid is determined to be a variable voltage control mode, the calculating reactive power adjustment amounts respectively corresponding to the power plant units in the direct current transmission end power grid according to the initial section data and the operation mode comprises:

get the T th ₀ Time-of-day converter station bus voltage information V _s，0，p Reactive voltage sensitivity information Sen of new energy power plant unit ₀ Optimal target set value of central bus voltage of converter station

Converting the converter station bus voltage information V _s，0，p Reactive voltage sensitivity information Sen of new energy power plant unit ₀ Optimal target set value of central bus voltage of converter station

6. The method of claim 5, wherein the adjusting the parameter of the new energy DC delivery side grid according to the reactive power adjustment amount of the new energy power plant unit comprises:

according to the reactive power adjustment quantity delta Q of the new energy power plant unit _g，0 And the reactive sensitivity information Sen of the new energy power plant unit ₀ And calculating to obtain the adjustment quantity delta V of the voltage of the high-voltage side bus of the new energy power plant ^h _s，0 ；

According to the adjustment quantity delta V of the high-voltage side bus voltage of the new energy power plant ^h _s，0 And the reactive sensitivity information Sen of the new energy power plant unit ₀ For new energy power plant unit at the T ₀ Updating the initial reactive power at the moment;

according to the latest new energy DC transmitting end power grid initial data section F _m，0 Can obtain the updated data section F of the new energy direct current transmission end power grid _m，1 ，F _m，1 As the T th ₀ +1 moment new energy direct current sending terminalThe power grid data section provides data support for the next round of automatic voltage control, and the automatic voltage control function of the new energy direct current transmission end power grid under the alternating current networking mode is realized.

7. The method of claim 5, wherein when the operation mode of the new energy direct current transmission end power grid is determined to be a constant voltage control mode, the adjusting the parameter of the new energy direct current transmission end power grid according to the reactive power adjustment amount of the new energy power plant unit comprises:

8. The method of claim 7, wherein the adjusting the parameter of the new energy DC delivery side grid according to the reactive power adjustment amount of the new energy power plant unit comprises:

according to the reactive power adjustment quantity delta Q of the new energy power plant unit _g，0 To and new energy power plant unit reactive sensitivity information Sen ₀ For new energy power plant unit at the T ₀ Updating the initial reactive power at the moment, the voltage of the high-voltage side bus and the voltage information of the converter station bus;

by adjusting the initial data section F of the new energy direct current transmission end power grid _m，0 Obtaining updated data section F of the new energy direct current transmission end power grid _m，1 ，F _m，1 As the T th ₀ The data section of the new energy direct current sending end power grid at +1 moment provides data support for the next round of automatic voltage control, and automatic voltage control in the new energy direct current sending end power grid island mode is realizedAnd (5) controlling functions.

9. The method according to claim 6 or 8, characterized in that the method further comprises:

10. A device for reactive voltage control in a dc link network, comprising:

11. The apparatus of claim 10, wherein the reading unit is further configured to:

12. The apparatus according to claim 11, wherein the determination unit comprises:

13. The apparatus according to claim 12, wherein the determination unit further comprises:

14. The apparatus according to claim 12, wherein when it is determined that the operation mode of the new energy dc transmission-side grid is the variable voltage control mode, the calculating unit includes:

a first obtaining module for obtaining the Tth ₀ Time-of-day converter station bus voltage information V _s，0，p Reactive voltage sensitivity information Sen of new energy power plant unit ₀ Optimal target set value of central bus voltage of converter station

15. The apparatus of claim 14, wherein the adjusting unit comprises:

a calculation module used for calculating the reactive adjustment quantity delta Q of the new energy power plant unit _g，0 And new energy power plant unit reactive sensitivity information Sen ₀ And calculating to obtain the adjustment quantity delta V of the voltage of the high-voltage side bus of the new energy power plant ^h _s，0 ；

A first updating module used for adjusting the delta V according to the high-voltage side bus voltage of the new energy power plant ^h _s，0 And the reactive sensitivity information Sen of the new energy power plant unit ₀ For new energy power plant unit at Tth ₀ Updating the initial reactive power at the moment;

a first circulation module for generating a new energy DC transmission end power grid initial data section F according to the latest new energy DC transmission end power grid initial data section _m，0 Can obtain the updated data section F of the new energy direct current transmission end power grid _m，1 ，F _m，1 As the T th ₀ And the data section of the new energy direct current transmission end power grid at the moment +1 provides data support for the next round of automatic voltage control, and the automatic voltage control function of the new energy direct current transmission end power grid in the alternating current networking mode is realized.

16. The apparatus according to claim 14, wherein when the new energy dc transmission grid is determined to operate in the constant voltage control mode, the calculating unit includes:

a second acquisition module for acquiring initial reactive information Gen of the new energy power plant unit _0，q Reactive voltage sensitivity information Sen of new energy power plant unit ₀ At the T-th ₀ Initial reactive power accumulation Gate of moment _0，q ；

A second input module used for inputting the initial reactive power information Gen of the new energy power plant unit _0，q Reactive power of new energy power plant unitPressure sensitivity information Sen ₀ At the T-th ₀ Initial reactive power accumulation Gate of moment _0，q Inputting a second minimum objective function to obtain a reactive adjustment quantity delta Q of the new energy power plant unit _g，0 。

17. The apparatus of claim 16, wherein the adjusting unit comprises:

a second updating module used for adjusting the quantity delta Q according to the reactive power of the new energy power plant unit _g，0 To and new energy power plant unit reactive sensitivity information Sen ₀ For new energy power plant unit at the T ₀ Updating the initial reactive power at the moment, the voltage of the high-voltage side bus and the voltage information of the converter station bus;

a second circulation module for adjusting the initial data section F of the new energy direct current transmission end power grid _m，0 Obtaining updated data section F of the new energy direct current transmission end power grid _m，1 ，F _m，1 As the T th ₀ And the data section of the new energy direct current transmission end power grid at the moment +1 provides data support for the next round of automatic voltage control, and the automatic voltage control function of the new energy direct current transmission end power grid in an island mode is realized.

18. The apparatus of claim 15 or 17, further comprising:

19. An electronic device, comprising:

at least one processor; and

a memory communicatively coupled to the at least one processor; wherein,

the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-9.

20. A non-transitory computer readable storage medium having stored thereon computer instructions for causing the computer to perform the method according to any one of claims 1-9.

21. A computer program product, characterized in that it comprises a computer program which, when being executed by a processor, carries out the method according to any one of claims 1-9.