CN115189362A - Method, device and electronic device for reactive power and voltage control in DC transmission end power grid - Google Patents

Abstract

The present disclosure provides a method, device and electronic device for reactive power and voltage control in a DC transmission end power grid. The main technical scheme includes: reading the initial data section of the new energy direct current transmission end power grid; according to the topology relationship of the grid model of the converter station, determining the operation mode of the new energy direct current transmission end power grid; according to the initial cross section data and operation mode , calculate the reactive power adjustment amount corresponding to each power plant unit in the DC transmission end power grid respectively; adjust the parameters of the new energy DC transmission end power grid according to the reactive power adjustment amount of the new energy power plant unit. A reactive power and voltage control method for multi-mode switching between the AC interconnection of the flexible direct transmission end power grid and the island system is realized. By coordinating the new energy power plant units, give full play to the reactive power regulation capability of the new energy cluster itself, to ensure the safe and stable operation of the reactive power and voltage in the island mode of the new energy DC sending end grid, thereby improving the automatic voltage of the new energy DC sending end grid control level.

Description

Method, device and electronic device for reactive power and voltage control in DC transmission end power grid

technical field

The present disclosure relates to the technical field of power grid dispatching, and in particular, to a method, device and electronic device for reactive power and voltage control in a DC transmission end power grid.

Background technique

In response to global climate change and energy crisis, the realization of low-carbon transformation has become the main theme of the development of the power industry in the world today. China continues to promote the adjustment of industrial structure and energy structure. To achieve carbon goals and build a new power system with new energy as the main body is one of the most important measures to achieve carbon peaking and carbon neutrality.

Considering that my country's new energy collection areas are generally located in remote areas such as deserts, Gobi, and deserts, and the new energy consumption capacity of large-scale wind power photovoltaic power generation projects is relatively limited, it is necessary to build a matching new energy transmission and transformation system to solve the problem of new energy. The transmission and consumption problems brought by large-scale grid connection, among which the flexible direct current transmission (referred to as "flexible direct") technology is of great significance to the power grid dispatching.

The converter station at the flexible direct transmission end needs to take into account the two operating modes of AC networking and AC islanding, that is, the flexible direct transmission end converter station normally operates in the AC island mode, and the new energy power plant is connected to the DC system of the converter station to realize grid-connected power generation. When the DC system of the converter station is overhauled, it is automatically switched to the AC network mode, and the new energy power plant is connected to the AC system of the converter station to realize grid-connected power generation.

It is the first time in the world that the island system of the flexible direct transmission end consisting of several million kilowatts of new energy and a single converter station is the first in the world, and there is no relevant experience at home and abroad to learn from. In the island mode, the flexible direct-sending converter station is similar to an infinite node, and its operating constraints are rigid constraints. Once the limit is exceeded, the entire system will be unstable. In addition, the reactive power and voltage control mode and strategy of the new energy cluster in the island mode are very different from the conventional AC power grid, which puts forward higher requirements for the reactive voltage of the new energy station.

SUMMARY OF THE INVENTION

The present disclosure provides a method, device and electronic device for reactive power and voltage control in a DC transmission end power grid. Its main purpose is to realize the reactive power and voltage control method of AC networking and AC island multi-mode switching of the new energy DC sending end grid.

According to a first aspect of the present disclosure, a method for reactive power and voltage control in a DC transmission end power grid is provided, including:

Read the initial data section of the new energy DC transmission end grid;

According to the topology relationship of the power grid model of the converter station, determine the operation mode of the new energy DC sending end power grid;

According to the initial section data and the operation mode, calculate the reactive power adjustment amount corresponding to each power plant unit in the DC transmission end power grid;

The parameters of the new energy direct current transmission end power grid are adjusted according to the reactive power adjustment amount of the new energy power plant unit.

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

Read the corresponding initial data section according to the preset control period T _c from the new energy direct current transmission end power grid model M;

Wherein, the initial section data includes line active power, line reactive power, bus voltage status to be monitored, operating status of new energy units, and reactive power sensitivity of new energy units in the new energy DC transmission end power grid.

Optionally, according to the topology relationship of the grid model of the converter station, determining the operation mode of the new energy DC transmission end grid includes:

If there is an electrical connection between the grid-connected busbar of the new energy power plant in the converter station and the DC system of the converter station and the electrical connection is disconnected from the main transformer of the converter station, the operation mode of the new energy DC transmission end power grid is determined as follows Communication island mode;

If there is an electrical connection between the grid-connected busbar of the new energy power plant in the converter station and the main transformer of the converter station, and the electrical connection is disconnected from the DC system of the converter station, the operation of the new energy DC transmission end power grid is determined. The method is the exchange network mode.

Optionally, the method further includes:

Setting the automatic voltage control mode of the AC island mode to a constant voltage control mode;

The automatic voltage control mode of the AC network mode is set 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, the reactive power adjustment corresponding to each power plant unit in the DC transmission end power grid is calculated according to the initial section data and the operation mode. Quantity includes:

Obtain the bus voltage information V _s,0,p of the converter station at time T ₀ , the reactive voltage sensitivity information Sen ₀ of the new energy power plant units, and the optimal target set value of the central bus voltage of the converter station

分别输入第一最小化目标函数，得到新能源电厂机组的无功调整量ΔQ_g,0。Set the bus voltage information V _s,0,p of the converter station, the reactive voltage sensitivity information Sen ₀ of the new energy power plant unit, and the optimal target setting value of the central bus voltage of the converter station

Enter the first minimization objective function respectively to obtain the reactive power adjustment amount ΔQ _g,0 of the new energy power plant unit.

Optionally, the adjustment of parameters of the new energy direct current 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 amount ΔQ _g,0 of the new energy power plant unit, and the reactive power sensitivity information Sen ₀ of the new energy power plant unit, the adjustment amount ΔV ^h _s,0 of the high-voltage side busbar voltage of the new energy power plant is calculated;

According to the adjustment amount ΔV ^h _s,0 of the high-voltage side busbar voltage of the new energy power plant and the reactive power sensitivity information Sen ₀ of the new energy power plant unit, update the initial reactive power of the new energy power plant unit at time T ₀ ;

According to the relevant information of the latest new energy DC transmission end grid initial data section F _m,0 , the updated new energy DC transmission end grid data section F _m,1 , F _m,1 can be obtained as the time T ₀ +1 time The new energy DC sending end grid data section provides data support for the next round of automatic voltage control, and realizes the automatic voltage control function under the AC networking mode of the new energy DC sending end grid.

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

Obtain the initial reactive power information Gen _0,q of the new energy power plant unit, the reactive power voltage sensitivity information Sen ₀ of the new energy power plant unit, and the initial reactive power accumulation Gate _0,q at time T ₀ ;

The initial reactive power information Gen _0,q of the new energy power plant unit, the reactive power and voltage sensitivity information Sen ₀ of the new energy power plant unit, and the initial reactive power accumulation Gate _0,q at time T ₀ are input into the second minimization The objective function is to obtain the reactive power adjustment amount ΔQ _g,0 of the new energy power plant unit.

Optionally, the adjustment of parameters of the new energy direct current 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 amount ΔQ _g,0 pair of the new energy power plant unit and the reactive power sensitivity information Sen ₀ of the new energy power plant unit, the initial reactive power of the new energy power plant unit at time T ₀ and the voltage of the high-voltage side busbar And the voltage information of the converter station bus is updated;

By adjusting the relevant information of the initial data section F _m,0 of the new energy DC transmission end grid, the updated data section F _m,1 and F _m,1 of the new energy DC transmission end power grid are obtained as the new energy at the time T ₀ +1 The data section of the DC sending end grid provides data support for the next round of automatic voltage control, and realizes the automatic voltage control function in the island mode of the new energy DC sending end grid.

Optionally, the method further includes:

Taking the preset control period T _c as the unit, periodically checking the topology state of the grid model of the new energy DC sending end grid converter station;

_The data section of the new energy DC transmission end power grid at time T1 is used as the initial data section _of the T1 cycle to perform automatic voltage control in the next cycle.

According to a second aspect of the present disclosure, there is provided a device for reactive power and voltage control in a DC transmission end power grid, including:

The reading unit is used to read the initial data section of the new energy DC transmission end power grid;

a determination unit, configured to determine the operation mode of the new energy direct current transmission end power grid according to the topology relationship of the power grid model of the converter station;

a calculation unit, configured to calculate 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;

The adjustment unit is used to adjust the parameters of the new energy direct current transmission end power grid according to the reactive power adjustment amount of the new energy power plant unit.

Optionally, the reading unit is also used for:

From the new energy DC transmission end grid model M, read the corresponding initial data section according to the preset clock;

Wherein, the initial section data includes line active power, line reactive power, bus voltage status to be monitored, operating status of new energy units, and reactive power sensitivity of new energy units in the new energy DC transmission end power grid.

Optionally, the determining unit includes:

The first determination module is used to determine the new energy DC if there is an electrical connection between the grid-connected busbar of the new energy power plant in the converter station and the DC system of the converter station and the electrical connection is disconnected from the main transformer of the converter station The operation mode of the sending-end power grid is the AC island mode;

The second determination module is configured to determine the new energy power plant in the converter station if there is an electrical connection between the grid-connected busbar of the new energy power plant and the main transformer of the converter station and the electrical connection is disconnected from the DC system of the converter station. The operation mode of the energy DC transmission end grid is the AC network mode.

Optionally, the determining unit further includes:

a first setting unit, configured to set the automatic voltage control mode of the AC island mode to a constant voltage control mode;

The second setting unit is used for setting the automatic voltage control mode of the AC network mode to the 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, the calculation unit includes:

The first acquisition module is used to acquire the bus voltage information V _s,0,p of the converter station at time T ₀ , the reactive power voltage sensitivity information Sen ₀ of the new energy power plant units, and the optimization target setting of the central bus voltage of the converter station value

分别输入第一最小化目标函数，得到新能源电厂机组的无功调整量ΔQ_g,0。The first input module is used to input the bus voltage information V _s,0,p of the converter station, the reactive voltage sensitivity information Sen ₀ of the new energy power plant unit, and the optimized target setting value of the central bus voltage of the converter station

Enter the first minimization objective function respectively to obtain the reactive power adjustment amount ΔQ _g,0 of the new energy power plant unit.

Optionally, the adjustment unit includes:

The calculation module is used for calculating the adjustment amount ΔV ^h _s,0 of the high-voltage side busbar voltage of the new energy power plant according to the reactive power adjustment amount ΔQ _g,0 of the new energy power plant unit and the reactive power sensitivity information Sen ₀ of the new energy power plant unit ;

The first update module is used for, according to the adjustment amount ΔV ^h _s,0 of the high-voltage side busbar voltage of the new energy power plant and the reactive power sensitivity information Sen ₀ of the new energy power plant unit, to update the initial non-active power of the new energy power plant unit at time T ₀ . to update;

The first cycle module is used to obtain the updated data section F _m,1 of the new energy DC transmission end power grid according to the relevant information of the latest new energy DC transmission end power grid initial data section F _m,0 , F _m,1 as The data section of the new energy DC sending end grid at time T ₀ +1 provides data support for the next round of automatic voltage control, and realizes the automatic voltage control function in the AC network mode of the new energy DC sending end grid.

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

The second acquisition module is used to acquire the initial reactive power information Gen _0,q of the new energy power plant unit, the reactive power voltage sensitivity information Sen ₀ of the new energy power plant unit, and the initial reactive power accumulation Gate _0,q at the time T ₀ ;

The second input module is used for adding Gate 0 the initial reactive power information Gen _0,q of the new energy power plant unit, the reactive power voltage sensitivity information Sen ₀ of the new energy power plant unit, and the initial reactive power accumulation at time T _{0 , q} , enter the second minimization objective function, and obtain the reactive power adjustment amount ΔQ _g,0 of the new energy power plant unit.

Optionally, the adjustment unit includes:

The second update module is configured to update the initial reactive power of the new energy power plant unit at time T ₀ according to the reactive power adjustment amount ΔQ _g,0 pair of the new energy power plant unit and the reactive power sensitivity information Sen ₀ of the new energy power plant unit And update the voltage information of the busbar on the high-voltage side and the busbar of the converter station;

The second loop module is used to obtain the updated data section F _m,1 and F _m,1 of the new energy DC sending end grid by adjusting the relevant information of the initial data section F _m,0 of the new energy DC sending end grid as the T-th The data section of the new energy DC sending end grid at time ₀ +1 provides data support for the next round of automatic voltage control, and realizes the automatic voltage control function in the island mode of the new energy DC sending end grid.

Optionally, the device further includes:

The checking unit is used to periodically check the topology state of the power grid model of the converter station of the new energy DC sending end power grid with the preset control period T _c as the unit;

The circulation unit is used to perform automatic voltage control in the next cycle by using the data section _of the new energy direct current transmission end power grid at time T1 as the initial data section _of the T1 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, the instructions being executed by the at least one processor to enable the at least one processor to perform the method of the aforementioned first aspect.

According to a fourth aspect of the present disclosure, there is provided a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to cause the computer to perform the method of the aforementioned first aspect.

According to a fifth aspect of the present disclosure, there is provided a computer program product comprising a computer program which, when executed by a processor, implements the method of the aforementioned first aspect.

The present disclosure provides a method, device and electronic device for reactive power and voltage control in a DC transmission end power grid. The main technical scheme includes: reading the initial data section of the new energy direct current transmission end power grid; according to the topology relationship of the grid model of the converter station, determining the operation mode of the new energy direct current transmission end power grid; according to the initial section data and the operation mode , calculate the reactive power adjustment amount corresponding to each power plant unit in the DC transmission end power grid; adjust the parameters of the new energy DC transmission end power grid according to the reactive power adjustment amount of the new energy power plant unit. A reactive power and voltage control method for multi-mode switching between the AC interconnection of the flexible direct-transmission end power grid and the island system is realized. By coordinating the new energy power plant units, the reactive power regulation ability of the new energy cluster itself can be fully utilized, so as to ensure the safe and stable operation of the reactive power and voltage in the island mode of the new energy DC sending end grid, thereby improving the automatic voltage of the new energy DC sending end grid. control level.

It should be understood that the content described in this section is not intended to identify key or critical features of the embodiments of the application, nor is it intended to limit the scope of the application. Other features of the present application will become readily understood from the following description.

Description of drawings

The accompanying drawings are used for better understanding of the present solution, and do not constitute a limitation to the present disclosure. in:

FIG. 1 is a schematic flowchart of a method for reactive power and voltage control in a DC transmission-end 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 end power 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 sending end power grid according to an embodiment of the present disclosure;

4 is a schematic structural diagram of a device for reactive power and voltage control in a DC transmission-end power grid according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of another device for reactive power and voltage control in a DC transmission-end 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 an embodiment of the present disclosure.

Detailed ways

Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings, which include various details of the embodiments of the present disclosure to facilitate understanding and should be considered as exemplary only. 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 present disclosure. Also, descriptions of well-known functions and constructions are omitted from the following description for clarity and conciseness.

The following describes the method, device and electronic device for reactive power and voltage control in the DC transmission end power grid according to the embodiments of the present disclosure with reference to the accompanying drawings.

FIG. 1 is a schematic flowchart of a method for reactive power and voltage control in a DC transmission end power grid according to an embodiment of the present disclosure.

As shown in Figure 1, the method includes the following steps:

Step 101: Read the initial data section of the new energy DC transmission end power grid.

Set the clock of the new energy DC sending end grid as T _m , and read the initial data section F _m,0 corresponding to the time T _m =T ₀ from the new energy DC sending end grid model M. F _m,0 includes information such as line active power, line reactive power, bus voltage status that needs to be monitored, operating status of new energy units, and reactive power sensitivity of new energy units in the new energy DC sending end grid:

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

Among them, the subscript m,0 corresponds to the clock T _m of the new energy DC sending end grid, the initial time of T _m is T ₀ , and the new energy unit Gen ₀ is the low-voltage side equivalent generator model of the new energy power plant (not the actual new energy power generation). machine).

Step 102 , according to the topology relationship of the grid model of the converter station, determine the operation mode of the new energy DC sending end grid.

Set the current operation mode of the new energy DC transmission end grid as M _d ;

M _d ={M _nom ,M _isd }

Among them, M _nom corresponds to the AC networking mode, and M _isd corresponds to the AC island mode.

Setting the automatic voltage control mode of the AC island mode to a constant voltage control mode;

The automatic voltage control mode of the AC network mode is set as a variable voltage control mode.

Step 103 , according to the initial section data and the operation mode, calculate the respective reactive power adjustment amounts corresponding to each power plant unit in the DC transmission end power grid.

Set the operation mode of the new energy DC transmission end grid at time T ₀ as M _d =M _isd , and the automatic voltage control mode corresponding to this operation mode (AC island mode) is the constant voltage control mode, that is:

Strg _m = [Strg _q ]

It is set that the operation mode of the new energy DC transmission end grid at time T ₀ is M _d =M _nom , and the automatic voltage control mode corresponding to this operation mode (AC network mode) is the variable voltage control mode, that is:

Strg _m = [Strg _u ]

According to different voltage control modes, the reactive power adjustment amount corresponding to each power plant unit in the DC transmission end grid is calculated.

Step 104: Adjust the parameters of the new energy direct current transmission end power grid according to the reactive power adjustment amount of the new energy power plant unit. According to the reactive power adjustment amount of the new energy power plant unit, adjust the reactive power output of the new energy power plant unit;

According to the reactive power adjustment amount of the new energy power plant unit, adjust the reactive power adjustment amount of the outgoing line of the new energy power plant;

Adjust the high-voltage side busbar of the new energy power plant according to the reactive power adjustment amount of the new energy power plant;

According to the reactive power adjustment amount of the new energy power plant units, adjust the busbar voltage of the converter station.

The present disclosure provides a method for reactive power and voltage control in a DC transmission end power grid. The main technical scheme includes: reading the initial data section of the new energy direct current transmission end power grid; according to the topology relationship of the grid model of the converter station, determining the operation mode of the new energy direct current transmission end power grid; according to the initial section data and the operation mode , calculate the reactive power adjustment amount corresponding to each power plant unit in the DC transmission end power grid; adjust the parameters of the new energy DC transmission end power grid according to the reactive power adjustment amount of the new energy power plant unit. A reactive power and voltage control method for multi-mode switching between the AC interconnection of the flexible direct-transmission end power grid and the island system is realized. By coordinating the new energy power plant units, the reactive power regulation ability of the new energy cluster itself can be fully utilized, so as to ensure the safe and stable operation of the reactive power and voltage in the island mode of the new energy DC sending end grid, thereby improving the automatic voltage of the new energy DC sending end grid. control level.

As a feasible way of the embodiment of the present application, the following methods can be adopted but not limited to:

Further, in the embodiment of the present disclosure, the reading of the initial section data of the power grid at the sending end of the new energy includes:

Read the corresponding initial data section according to the preset control period T _c from the new energy direct current transmission end power grid model M;

Wherein, the initial section data includes line active power, line reactive power, bus voltage status to be monitored, operating status of new energy units, and reactive power sensitivity of new energy units in the new energy DC transmission end power grid.

(2) Set the clock of the new energy DC sending end grid as T _m , and read the initial data section F _m,0 corresponding to the time T _m =T ₀ from the new energy DC sending end grid model M, where F _m,0 includes Information such as line active power, line reactive power, bus voltage status that needs to be monitored, operating status of new energy units, and reactive power sensitivity of new energy units in the new energy DC transmission end power grid:

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

Among them, the subscript m,0 corresponds to the clock T _m of the new energy DC sending end grid, the initial time of T _m is T ₀ , and the new energy unit Gen ₀ is the low-voltage side equivalent generator model of the new energy power plant (not the actual new energy power generation). machine).

(2-1) Set the serial number of the outgoing lines of the new energy power plants in the new energy DC transmission end grid as l, l=1...L, L represents the total number of outgoing lines of the new energy power plants in the new energy DC transmission end power grid model M, Ln _0,p and Ln _0,q are the initial active and initial reactive power of the new energy power plant outgoing line at time T ₀ .

Ln _0,p =[l,l=1,..L]{P _0,l }

Ln _0,q =[l,l=1,..L]{Q _0,l }

Among them, P _0,l and Q _0,l are the active power and initial reactive power of the lth new energy power plant outgoing line at the _T0th moment;

(2-2) Set the serial number of the busbars to be monitored in the new energy DC transmission end grid as s, s=1, set the new S, S represents the total number of buses to be monitored in the new energy DC transmission end grid model M, V _{0, p} and V _0,h are the initial state information of the AC bus voltage of the converter station and the bus voltage of the high-voltage side of the new energy power plant in the new energy DC transmission end power grid at time T ₀ respectively.

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

Among them, V _s,0,p and V _s,0,h are the voltage status information of the AC bus of the converter station and the high-voltage side bus of the new energy power plant that need to be monitored at time T ₀ respectively.

(2-2-1) Assume that the voltage information of the s-th converter station bus to be monitored at time T ₀ is V _s,0,p , and its composition is as follows:

V _{s, 0, p} ⁼ {V ps _{, 0, val} , V ^ps _{, 0, max} , V ^ps _{, 0, min} }

Among them, V ^p _{s, 0, val} is the voltage sampling value of the s-th converter station bus to be monitored at time T0, V ^p _{s, 0, max} is the s-th converter station bus to be monitored at T The voltage upper limit value at time ₀ , V ^p _{s, 0, min} is the voltage lower limit value at time T ₀ of the s-th converter station bus that needs to be monitored.

(2-2-2) Assume that the voltage information of the high-voltage side busbar of the new energy power plant that needs to be monitored at time T ₀ is V _{s, 0, h} , and its composition is as follows:

V _{s, 0, h} = {V ^h _{s, 0, val} , V ^h _{s, 0, max} , V ^h _{s, 0, min} }

Among them, V ^h _{s, 0, val} is the voltage sampling value of the high-voltage side bus of the s-th new energy power plant that needs to be monitored at time T ₀ , and V ^h _{s, 0, max} is the s-th new energy power plant high voltage that needs to be monitored. The upper limit of the voltage of the side bus at time T ₀ , V ^h _{s, 0, min} is the lower limit of the voltage of the high-voltage side bus of the s-th new energy power plant that needs to be monitored at time T ₀ .

(2-3) Set the serial number of the new energy power plant units in the new energy DC transmission end grid as g, g=g...G, G represents the total number of new energy power plant units in the new energy DC transmission end grid model M, Gen _{0, p} and Gen _{0, q} are the initial active power and initial reactive power of the new energy power plant unit at time T ₀ .

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

Among them, Gen _{g, 0, p} and Gen _{g, 0, q} are the active and reactive power information of the g-th new energy power plant unit at time T ₀ , respectively.

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

Gen _{g, 0, p} = {Gen ^p _{g, 0, val} , Gen ^p _{g, 0, max} , Gen ^p _{g, 0, min} }

Among them, Gen ^P _{g, 0, val} is the active power sampling value of the g-th new energy power plant unit at time T ₀ , and Gen ^p _{g, 0, max} is the active power of the g-th new energy power plant unit at time T ₀ The limit value, Gen ^P _{g, 0, min} is the lower limit value of the active power of the g-th new energy power plant unit at time T ₀ .

(2-3-2) The active power information Gen _{g, 0, q} of the g-th new energy power plant unit at time T0 is composed as follows:

Gen _{g, 0, q} = {Gen ^q _{g, 0, val} , Gen ^q _{g, 0, max} , Gen ^q _{g, 0, min} }

Among them, Gen ^q _{g, 0, val} is the reactive power sampling value of the g-th new energy power plant unit at time T0, and Gen ^q _{g, 0, max} is the reactive power of the g-th new energy power plant unit at time T ₀ The upper limit value, Gen ^q _{g, 0, min} is the lower limit value of reactive power of the gth new energy power plant unit at time T ₀ .

(2-4) Set the serial number of the new energy power plant units in the new energy DC transmission end grid as g, g=g...G, G represents the total number of new energy power plant units in the new energy DC transmission end grid model M, Sen _{0, lq} and Sen _{0, hv} and Sen _{0, pv} are the sensitivity of the new energy power plant units to the reactive power of the new energy power plant outlet at time T ₀ , the sensitivity to the voltage of the high-voltage side busbar of the new energy power plant, and the sensitivity to the busbar of the converter station. voltage sensitivity.

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

Among them, Sen _{g, 0, lq} , Sen _{g, 0, hv} , Sen _{g, 0, pv} are the new energy power plant outlet reactive power sensitivity, new energy power plant high voltage corresponding to the gth new energy power plant unit at time T ₀ , respectively Side bus voltage sensitivity, converter station bus voltage sensitivity.

(2-4-1) Set the reactive power adjustment amount of the g-th new energy power plant unit at time T0 as ΔQ _{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)

Among them, ΔQ _{l, 0} is the reactive power adjustment of the g-th new energy unit at time T _0; ΔQ _{g, 0} is the reactive power change of the outlet of the l-th new energy power plant at time T 0; ΔV ^h _{s, 0} is the first time T ₀ . Reactive power adjustment of g new energy units ΔQ _{g, 0} , the voltage change of the high-voltage side busbar of the s-th new energy power plant to be monitored; ΔV ^p _{s, 0} is the reactive power adjustment ΔQ of the g-th new energy unit at time T ₀ When _{g, 0} , the voltage variation of the busbar of the converter station that needs to be monitored in the sth section.

Further, in order to facilitate the understanding of the AC island mode of the new energy DC sending end power grid and the AC networking mode of the new energy DC sending end power grid, as shown in FIG. 2 , FIG. A schematic diagram of an AC islanding mode of a sending-end power grid; as shown in FIG. 3 , FIG. 3 is a schematic diagram of an AC networking mode of a new energy DC sending-end power grid according to an embodiment of the present disclosure.

In the embodiment of the present disclosure, the determining of the operation mode of the new energy DC transmission end power grid according to the topology relationship of the power grid model of the converter station includes:

If there is an electrical connection between the grid-connected busbar of the new energy power plant in the converter station and the DC system of the converter station and the electrical connection is disconnected from the main transformer of the converter station, the operation mode of the new energy DC transmission end power grid is determined as follows Communication island mode;

If there is an electrical connection between the grid-connected busbar of the new energy power plant in the converter station and the main transformer of the converter station, and the electrical connection is disconnected from the DC system of the converter station, the operation of the new energy DC transmission end power grid is determined. The method is the exchange network mode.

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

Setting the automatic voltage control mode of the AC island mode to a constant voltage control mode;

The automatic voltage control mode of the AC network mode is set as a variable voltage control mode.

Set the automatic voltage control mode of the new energy DC transmission end grid to Strg _m ;

Strg _m = {Strg _u , Strg _q }

Among them, Strg _u is the variable voltage control mode, and Strg _a is the constant voltage control mode.

The corresponding relationship between the operation mode of the new energy DC transmission end grid and the automatic voltage control mode is as follows:

When the operation mode of the new energy DC sending end grid converter station is AC networking:

Strg _m =[Strg _u ]{M _d =M _nom }

When the operation mode of the new energy DC sending end grid converter station is AC island:

Strg _m =[Strg _q ]{M _d =M _isd }

Further, in the embodiment of the present disclosure, when it is determined that the operation mode of the new energy DC transmission-end power grid is the variable voltage control mode, the calculation of each power plant unit in the DC transmission-end power grid is performed according to the initial section data and the operation mode. The corresponding reactive power adjustments include:

Obtain the bus voltage information V _{s, 0, p} of the converter station at time T0, the reactive voltage sensitivity information Sen ₀ of the new energy power plant units, and the optimal target setting value of the central bus voltage of the converter station

分别输入第一最小化目标函数，得到新能源电厂机组的无功调整量ΔQ_g，0。Set the bus voltage information V _s,0,p of the converter station, the reactive voltage sensitivity information Sen ₀ of the new energy power plant unit, and the optimal target setting value of the central bus voltage of the converter station

Enter the first minimization objective function respectively to obtain the reactive power adjustment amount ΔQ _g,0 of the new energy power plant unit.

(3) Set the operation mode of the new energy DC transmission end grid at time T ₀ as M _d =M _nom , and the automatic voltage control method corresponding to this operation mode (AC network mode) is as follows:

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

Strg _m = [Strg _u ]

At this time, the new energy DC sending end grid needs to achieve voltage control that is coordinated with the upper-level power grid. On the one hand, the voltage regulation goals of each plant and station should be coordinated with the voltage of the upper-level power grid to meet the new energy DC sending end grid. On the other hand, it is necessary to consider the adjustment and coordination of reactive power resources of the upper-level power grid to realize the rational flow of reactive power in the area of the new energy DC transmission end power grid and the upper and lower power grids.

Therefore, the goal of the automatic voltage control strategy of the new energy DC transmission end grid is to achieve voltage coordination with the upper-level power grid and reactive power optimization of the whole network by adjusting the voltage of the central busbar of the converter station and the voltage of the high-voltage side control busbar of the new energy power plant. The goal.

(3-2) In the AC network mode of the new energy DC transmission end power grid, the reactive power output of the new energy power plant units is changed through the automatic voltage control strategy, and the voltage of the high voltage side control bus of the new energy power plant and the voltage of the central bus of the converter station are adjusted. voltage, so that the voltage of the central busbar of the converter station is as close as possible to the optimal voltage setting value given by the upper power grid

To this end, an objective function can be constructed that takes the central busbar voltage of the converter station as the optimization objective and adopts a quadratic programming model:

表示换流站中枢母线电压的优化设定值，该值由上级电网的全局无功优化给出；Sen_g，pv为机组无功对换流站母线电压的灵敏度；θ_g为机组无功均衡指标；W_p和W_q为该函数的两个权重系数。Among them, ΔQ _g is the unit reactive power adjustment amount of the new energy power plant, which is the optimization variable of this function; V ^p _{s, val} represents the current value of the central bus voltage of the converter station;

represents the optimal set value of the central bus voltage of the converter station, which is given by the global reactive power optimization of the upper-level power grid; Sen _{g, pv} are the sensitivity of the reactive power of the unit to the bus voltage of the converter station; θ _g is the reactive power balance of the unit Indicator; W _p and W _q are the two weight coefficients of the function.

θ _g is used as the reactive power balance index of the unit, and its meaning is:

Among them, Gen ^q _g,val , Gen ^q _g,max and Gen ^q _g,min represent the current reactive power, upper reactive power limit and lower reactive power limit of the new energy power plant units, respectively.

第二部分将||θ_g||²引入到目标函数中，一方面保证增加新能源电厂机组的无功调节裕度，另一方面促使区域内各新能源电厂机组无功出力往更加均衡的方向发展，体现了在达到优化目标

的同时，尽量保证各新能源电厂无功出力的均衡性。The first part of the minimization objective function adjusts the reactive power output of the new energy power plant unit through ΔQ _g , so that the bus voltage V ^p _{s, val} of the converter station is as close to the optimal target value as possible

The second part introduces ||θ _g || ² into the objective function, on the one hand, it ensures to increase the reactive power regulation margin of the new energy power plant units, and on the other hand, promotes the reactive power output of each new energy power plant unit in the region to be more balanced. direction development, reflecting the achievement of optimization goals

At the same time, try to ensure the balance of reactive power output of each new energy power plant.

把以上数据带入步骤(3-2)的最小化目标函数得到：(3-3) At time T ₀ , obtain the busbar voltage information V _s,0,p of the converter station according to step (2-2), and obtain the reactive voltage sensitivity information of the new energy power plant unit according to step (2-4) Sen ₀ , according to step (3-2), the optimized target setting value of the voltage of the central busbar of the converter station is obtained

Bring the above data into the minimization objective function of step (3-2) to get:

The quadratic programming problem is solved by the working set algorithm, and the reactive power adjustment amount ΔQ _g,0 of the new energy power plant unit is obtained.

Further, in the embodiment of the present disclosure, the adjustment of the parameters of the new energy direct current 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 amount ΔQ _g,0 of the new energy power plant unit, and the reactive power sensitivity information Sen ₀ of the new energy power plant unit, the adjustment amount ΔV ^h _s,0 of the high-voltage side busbar voltage of the new energy power plant is calculated;

According to the adjustment amount ΔV ^h _s,0 of the high-voltage side busbar voltage of the new energy power plant and the reactive power sensitivity information Sen ₀ of the new energy power plant unit, update the initial reactive power of the new energy power plant unit at time T ₀ ;

According to the relevant information of the latest new energy DC transmission end grid initial data section F _{m, 0} , the updated new energy DC transmission end grid data section F _{m, 1} , F _{m, 1} can be obtained as the time T ₀ +1 time The new energy DC sending end grid data section provides data support for the next round of automatic voltage control, and realizes the automatic voltage control function under the AC networking mode of the new energy DC sending end grid.

(3-4) According to the reactive power adjustment amount ΔQ _g,0 of the new energy power plant unit obtained in step (3-3), use the reactive power sensitivity information Sen ₀ of the new energy power plant unit in step (2-4) to obtain the high voltage of the new energy power plant Adjustment of side bus voltage ΔV ^h _{s, 0} :

ΔV ^h _s,0 =Seng _,0,hv *ΔQg _,0

The main station sends the adjustment amount ΔV ^h _{s, 0} of the high-voltage side busbar voltage of the new energy power plant as a control strategy to the new energy power plant sub-station system, and the final control execution is completed by the new energy power plant sub-station system.

(3-5) According to the adjustment amount ΔV ^h _s,0 of the high-voltage side busbar voltage of the new energy power plant obtained in the step (3-4), the new energy power plant sub-station system uses the step (2-4) of the new energy power plant unit reactive power sensitivity The information Sen ₀ is converted into the reactive power adjustment amount ΔQ _g,0 of the new energy power plant unit. Utilize ΔQ _{g, 0} to update step (2-3) new energy power plant unit information Gen ₀ to obtain Gen′ ₀ :

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

Among them, Gen′ _{g, 0, q} is the information adjusted according to ΔQ _g , 0 of the reactive power of the g-th new energy power plant unit at time T0.

According to step (2-3-2), it can be known that:

Gen' _{g, 0, q} = {(Gen q g, _{0, val} +ΔQ _{g, 0} ), Gen ^q _{g, 0, max} , Gen ^q _{g, 0, min} }

(3-6) According to the reactive power adjustment amount ΔQ _{g, 0} of the new energy power plant unit obtained in step (3-5) and the reactive power sensitivity information Sen ₀ of the new energy power plant unit in step (2-4), update step (2-1) ) The reactive power information of the outgoing line of the new energy power plant and step (2-2) the voltage information of the high voltage side busbar of the new energy power plant and the voltage information of the converter station busbar.

(3-6-1) Update the outgoing reactive power information Ln _0,q of the new energy power plant in step (2-1) to obtain Ln′ _0,q :

Ln' _{0, q} = [l, l=1, ..L]{Q' _{0, l} }

Among them, Q' _{0, l} is the information after the reactive power output of the unit is adjusted according to ΔQ _{g, 0} for the reactive power of the outgoing line of the lth new energy power plant at time T ₀ .

Q' _0,l =Q _0,l +ΔQl _,0

Among them, Q 0,1 is the initial reactive power information of the outgoing line of the lth new energy power plant at time T ₀ , and ΔQ _{l,0 is} the reactive power adjustment amount of the outgoing line of the new energy power plant.

According to step (2-4-1), it can be known that the relationship between the reactive power adjustment amount ΔQ _l,0 of the outlet of the new energy power plant and the reactive power adjustment amount ΔQ _g,0 of the new energy power plant unit is:

ΔQ _l,0 =Seng _,0,lq *ΔQg _,0

(3-6-2) Update the high-voltage side busbar voltage information V _s,0,h of the new energy power plant in step (2-2) 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} }

Among them, V ^h' _{s, 0, val} is the information after the reactive power output of the unit is adjusted according to ΔQ _{g, 0} of the bus voltage of the high-voltage side of the new energy power plant that needs to be monitored for the s-th new energy power plant at time T ₀ .

V ^h' _{s, 0, val} = V ^h _{s, 0, val} +ΔV ^h _{s, 0}

Among them, V ^h _{s, 0, val} is the initial information of the high-voltage side busbar voltage of the new energy power plant that needs to be monitored at time T ₀ , and ΔV ^h _{s, 0} is the voltage adjustment of the high-voltage side busbar of the new energy power plant.

According to step (2-4-1), it can be known that the relationship between the voltage adjustment amount ΔV ^h _s,0 of the high-voltage side busbar of the new energy power plant and the reactive power adjustment amount ΔQ _{g, 0} of the new energy power plant unit is:

ΔV ^h _s,0 =Seng _,0,hv *ΔQg _,0

(3-6-3) Update the bus voltage information V _s,0,p of the converter station in step (2-2) to obtain V′ _s,0,p :

V' _{s, 0, p} = {V ^p' _{s, 0, val} , V ^ps _{, 0, max} , V ^ps _{, 0, min} }

Among them, V ^p′ _{s, 0, val} is the information after the reactive power output of the unit is adjusted according to ΔQ _{g, 0} of the bus voltage of the s-th converter station that needs to be monitored at time T ₀ .

V ^p' _s,0,val = ^Vps _,0,val + ^ΔVps _,0

Among them, ^Vps _,0,val is the initial information of the busbar voltage of the converter station that needs to be monitored at the time T0, and ^ΔVps _{,0 is} the voltage adjustment amount of the busbar of the converter station.

According to step (2-4-1), it can be known that the relationship between the voltage adjustment amount ΔV ^p _{s, 0} of the converter station busbar and the reactive power adjustment amount ΔQ _{g, 0} of the new energy power plant unit is:

ΔV ^p _s,0 =Seng _,0,pv *ΔQg _,0

(3-7) By adjusting the relevant information of the initial data section F _{m, 0} of the new energy DC transmission end power grid in step (3-6), the updated data section F _{m, 1} , F _m of the new energy DC transmission end power grid can be obtained _{, 1} is the grid data section of the new energy DC sending end at time T ₀ +1 to provide 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 time T ₀ +1, according to the data section F _m,1 of the new energy DC transmission end power grid obtained in step (3-7), repeat the process of steps (3-3) to (3-7) , perform the automatic voltage control calculation at the T ₀ +1th moment, and obtain the data section F _m,2 at the next moment.

(3-9) Referring to step (3-8), cycle in turn to realize the automatic voltage control function in the AC network mode of the new energy DC sending end power grid.

Further, in the embodiment of the present disclosure, when it is determined that the operation mode of the new energy direct current transmission end power grid is the constant voltage control mode, the adjustment of the new energy direct current transmission end power grid according to the reactive power adjustment amount of the new energy power plant unit. Parameters include:

Obtain the initial reactive power information Gen _0,q of the new energy power plant unit, the reactive power voltage sensitivity information Sen ₀ of the new energy power plant unit, and the initial reactive power accumulation Gate _0,q at the T _0th time;

The initial reactive power information Gen _0,q of the new energy power plant unit, the reactive power and voltage sensitivity information Sen ₀ of the new energy power plant unit, and the initial reactive power accumulation Gate _0,q at the T _0th time are input into the second minimization The objective function is to obtain the reactive power adjustment amount ΔQ _g,0 of the new energy power plant unit.

Set the operation mode of the new energy DC transmission end grid at time T0 as M _d =M _isd , and the automatic voltage control method corresponding to this operation mode (AC island mode) is as follows:

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

Strg _m = [Strg _q ]

At this time, the new energy DC sending end grid adopts a constant voltage control strategy for the busbar in the converter station. When the intermittent fluctuation of the active power in the new energy area causes the voltage fluctuation of the converter station busbar, the control system in the converter station will respond quickly by adjusting the flexible DC The reactive power output of the system keeps the bus voltage of the converter station constant.

Therefore, the goal of the automatic voltage control strategy of the new energy DC transmission end power grid is to give full play to the reactive power regulation ability of the new energy power plant itself, to provide reactive power compensation for the new energy power generation and transmission, and to reduce the reactive power support of the flexible direct system of the converter station. , to improve the dynamic reactive power margin of the flexible straight system of the converter station.

(4-2) Set the reactive power exchange gate between the new energy power plant and the new energy DC sending-end converter station as Gate _m , and the components of the gate are the outgoing lines of all new energy power plants connected to the converter station.

At time T ₀ , the reactive power sampling value of the reactive power exchange gateway Gate _m is Gate _{0, q} . According to step (2-1), it can be known that:

Among them, Gate _{0, q} is the initial reactive power accumulation of the outlet of the new energy power plant connected to the converter station at time T0.

(4-3) According to step (4-1), it can be seen that the goal of the automatic voltage control strategy of the new energy DC transmission end grid is that the new energy power plant relies on its own adjustment ability to provide reactive power compensation, so as to improve the reactive power reserve of the converter station flexible direct system . That is, by adjusting the reactive power output of the new energy power plant units, the reactive power interaction between the new energy power plant and the converter station is minimized.

To this end, an objective function can be constructed that takes the reactive power of the gate _m of the converter station as the optimization objective and adopts the quadratic programming model:

Among them, ΔQ _g is the unit reactive power adjustment amount of the new energy power plant, which is the optimization variable of this function; Gate _q represents the current reactive power of the converter station gateway; Gate ^set _q is the reactive power control target set value of the gateway, which is generally is 0, and can also be updated in real time according to the operation mode of the new energy DC transmission end grid; Sen _{g, lq} are the sensitivity of the reactive power of the unit to the line mentioned in step (2-4); θ _g is the reactive power balance index of the unit; W _p and W _q are the two weight coefficients of the function.

θ _g is used as the reactive power balance index of the unit, and its meaning is:

Among them, Gen ^q _g,val , Gen ^q _g,max and Gen ^q _g,min represent the current reactive power, upper reactive power limit and lower reactive power limit of the new energy power plant units, respectively.

The first part of minimizing the objective function adjusts the reactive power output of the new energy power plant unit through _ΔQg , so that the reactive power Gate _q of the converter station gate is as close to the target value Gate ^set _q as possible. The second part introduces ||θ _g || ² into the objective function, on the one hand, it ensures to increase the reactive power regulation margin of the new energy power plant units, and on the other hand, promotes the reactive power output of each new energy power plant unit in the region to be more balanced. The direction of development reflects the balance of reactive power output of each new energy power plant as much as possible while achieving the control target Gate ^set _q .

(4-4) At time T ₀ , the reactive power information Gen _0,q of the new energy power plant unit is obtained according to step (2-3), and the reactive power and voltage sensitivity information of the new energy power plant unit is obtained according to step (2-4) Sen ₀ , according to step (4-2), the reactive power Gate _0,q of the converter station gate is obtained, and the above data is brought into the minimization objective function of step (4-3) to obtain:

The quadratic programming problem is solved by the working set algorithm, and the reactive power adjustment amount ΔQ _{g,0 of the new energy power plant unit is obtained. The master station sends the reactive power adjustment amount ΔQ g, 0 of} the new energy power plant unit as a control strategy to the new In the sub-station system of the energy power plant, the execution of the final control is completed by the sub-station system of the new energy power plant.

Further, in the embodiment of the present disclosure, the adjustment of the parameters of the new energy direct current 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 amount ΔQ _{g of the new energy power plant unit, 0} pair and the reactive power sensitivity information Sen ₀ of the new energy power plant unit, the initial reactive power of the new energy power plant unit at time T ₀ and the voltage of the high-voltage side busbar And the voltage information of the converter station bus is updated;

By adjusting the relevant information of the initial data section F _{m, 0} of the new energy DC transmission end grid, the updated data section F _{m, 1} , F _{m, 1} of the new energy DC transmission end power grid is obtained as the new energy at time T ₀ +1 The data section of the DC sending end grid provides data support for the next round of automatic voltage control, and realizes the automatic voltage control function in the island mode of the new energy DC sending end grid.

(4-5) The new energy power plant sub-station system updates the new energy power plant unit information Gen ₀ in step (2-3) according to the new energy power plant unit reactive power adjustment amount ΔQ _g,0 obtained in step (4-4), and obtains Gen 0 . ' ₀ :

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

Among them, Gen′ _{g, 0, q} is the information of the reactive power of the g-th new energy power plant unit adjusted according to ΔQ _{g, 0} at time T ₀ .

According to step (2-3-2), it can be known that:

Gen' _{g, 0, q} = {(Gen ^q _{g, 0, val} +ΔQ _{g, 0} ), Gen ^q _{g, 0, max} , Genq _{g, 0, min} }

(4-6) According to the reactive power adjustment amount ΔQ _g,0 of the new energy power plant unit obtained in step (4-4) and the reactive power sensitivity information Sen ₀ of the new energy power plant unit in step (2-4), update step (2-1) ) The reactive power information of the outgoing line of the new energy power plant and step (2-2) the voltage information of the high voltage side busbar of the new energy power plant and the voltage information of the converter station busbar.

(4-6-1) Update the outgoing reactive power information Ln _0,q of the new energy power plant in step (2-1) to obtain Ln′ _0,q :

Ln' _{0, q} = [l, l=1, ..L]{Q' _{0, l} }

Wherein, Q′ 0,1 is the information adjusted according to ΔQ _{g, 0} of the reactive power of the outlet of the _lth new energy power plant at time T ₀ .

Q' _0,l =Q _0,l +ΔQl _,0

Among them, Q 0,1 is the initial reactive power information of the outgoing line of the lth new energy power plant at time T ₀ , and ΔQ _{l,0 is} the reactive power adjustment amount of the outgoing line of the new energy power plant.

According to step (2-4-1), it can be known that the relationship between the reactive power adjustment amount ΔQ _l,0 of the outlet of the new energy power plant and the reactive power adjustment amount ΔQ _g,0 of the new energy power plant unit is:

ΔQ _l,0 =Seng _,0,lq *ΔQg _,0

(4-6-2) Update the high-voltage side busbar voltage information V _s,0,h of the new energy power plant in step (2-2) 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} }

Among them, V ^h' _{s, 0, val} is the information adjusted according to ΔQ _{g, 0} of the bus voltage of the high-voltage side of the new energy power plant that needs to be monitored at the sth time T ₀ .

V ^h' _{s, 0, val} = V ^h _{s, 0, val} +ΔV ^h _{s, 0}

Among them, V ^h _{s, 0, val} is the initial information of the high-voltage side busbar voltage of the new energy power plant that needs to be monitored at time T ₀ , and ΔV ^h _{s, 0} is the voltage adjustment of the high-voltage side busbar of the new energy power plant.

According to step (2-4-1), it can be known that the relationship between the voltage adjustment amount ΔV ^h _s,0 of the high-voltage side busbar of the new energy power plant and the reactive power adjustment amount ΔQ _{g, 0} of the new energy power plant unit is:

ΔV ^h _s,0 =Seng _,0,hv *ΔQg _,0

(4-6-3) Update the bus voltage information V _s,0,p of the converter station in step (2-2) to obtain V′ _s,0,p :

V' _{s, 0, p} = {V ^p' _{s, 0, val} , V ^ps _{, 0, max} , V ^ps _{, 0, min} }

Wherein, V ^p′ _{s, 0, val} is the information adjusted according to ΔQ _{g, 0} of the bus voltage of the s-th converter station that needs to be monitored at time T ₀ .

V ^p' _{s, 0, val} = V ^p _{s, 0, val} +ΔV ^p _{s, 0}

Among them, ^Vps _,0,val is the initial information of the busbar voltage of the converter station that needs to be monitored at the time T0, and ^ΔVps _{,0 is} the voltage adjustment amount of the busbar of the converter station.

According to step (2-4-1), it can be known that the relationship between the voltage adjustment amount ΔV ^p _{s, 0} of the converter station busbar and the reactive power adjustment amount ΔQ _{g, 0} of the new energy power plant unit is:

ΔV ^p _s,0 =Seng _,0,pv *ΔQg _,0

(4-7) By adjusting the relevant information of the initial data section F _{m, 0} of the new energy DC transmission end power grid in step (4-6), the updated data section F _{m, 1} , F _m of the new energy DC transmission end power grid can be obtained _{, 1} is the grid data section of the new energy DC sending end at time T ₀ +1 to provide 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 time T ₀ +1, according to the data section F _m,1 of the new energy DC transmission end power grid obtained in step (4-7), repeat the process of steps (4-4) to (4-7). , perform the automatic voltage control calculation at the T0+1th moment, and obtain the data section F _m,2 at the next moment.

(4-9) Referring to step (4-8), the cycle is performed in sequence to realize the automatic voltage control function in the island mode of the new energy DC transmission end power grid.

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

Taking the preset control period T _c as the unit, periodically checking the topology state of the grid model of the new energy DC sending end grid converter station;

_The data section of the new energy DC transmission end power grid at time T1 is used as the initial data section of the T1 cycle to perform automatic voltage control in the next cycle.

In the actual new energy DC sending end grid automatic voltage control system, the system uses the automatic voltage control period _Tc as the unit to periodically check the grid model topology state of the new energy DC sending end grid converter station.

Set the automatic voltage control period of the new energy DC transmission end grid as T _c .

When the operation mode of the new energy DC sending end grid is the AC network mode, the automatic voltage control system of the new energy DC sending end grid will automatically switch to the AC network mode M _nom , and will face the new energy DC in the subsequent automatic voltage control period T _c The sending-end power grid performs reactive power and voltage control according to the method of step (3).

When the operation mode of the new energy DC sending end grid is the AC island mode, the automatic voltage control system of the new energy DC sending end grid will automatically switch to the AC island mode _Misd , and face the new energy DC in the subsequent automatic voltage control period T _c The sending-end power grid performs reactive power and voltage control according to the method of step (4).

In summary, the reactive power and voltage control function of automatic switching between AC networking and islanding mode in the new energy DC sending end grid is realized.

Corresponding to the above-mentioned method for controlling reactive power and voltage in the power grid at the DC transmission end, the present invention also provides a device for controlling reactive power and voltage in the power grid at the DC transmission end. Since the apparatus embodiments of the present invention correspond to the above-mentioned method embodiments, for details not disclosed in the apparatus embodiments, reference may be made to the above-mentioned method embodiments, which will not be repeated in the present invention.

FIG. 4 is a schematic structural diagram of a device for reactive power and voltage control in a DC transmission-end power grid provided by an embodiment of the present disclosure, as shown in FIG. .

The reading unit 51 is used to read the initial data section of the new energy direct current transmission end power grid;

The determination unit 52 is configured to determine the operation mode of the new energy direct current transmission end power grid according to the topology relationship of the power grid model of the converter station;

The calculation unit 53 is configured to calculate 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;

The adjustment unit 54 is configured to adjust the parameters of the new energy direct current transmission end power grid according to the reactive power adjustment amount of the new energy power plant unit.

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

From the new energy DC transmission end grid model M, read the corresponding initial data section according to the preset clock;

Wherein, the initial section data includes line active power, line reactive power, bus voltage status to be monitored, operating status of new energy units, and reactive power sensitivity of new energy units in the new energy DC transmission end power grid.

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

The first determination module 521 is configured to determine the new energy source if there is an electrical connection between the grid-connected busbar of the new energy power plant in the converter station and the DC system of the converter station and the electrical connection is disconnected from the main transformer of the converter station The operation mode of the DC transmission end grid is the AC island mode;

The second determination module 522 is configured to determine if there is an electrical connection between the grid-connected busbar of the new energy power plant in the converter station and the main transformer of the converter station and the electrical connection is disconnected from the DC system of the converter station. The operation mode of the new energy DC transmission end grid is the AC network mode.

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

The first setting module 523 is used to set the automatic voltage control mode of the AC island mode to a constant voltage control mode;

The second setting module 524 is configured to set the automatic voltage control mode of the AC network mode to the variable voltage control mode.

Further, in the embodiment of the present disclosure, as shown in FIG. 5 , when it is determined that the operation mode of the new energy DC transmission end power grid is the variable voltage control mode, the calculation unit 53 includes:

The first acquisition module 531 is used to acquire the bus voltage information V _s,0,p of the converter station at time T ₀ , the reactive power voltage sensitivity information Sen ₀ of the new energy power plant unit, and the optimization target setting of the central bus voltage of the converter station. Value

分别输入第一最小化目标函数，得到新能源电厂机组的无功调整量ΔQ_g，0。The first input module 532 is used to input the bus voltage information V _s,0,p of the converter station, the reactive voltage sensitivity information Sen ₀ of the new energy power plant unit, and the optimized target setting value of the central bus voltage of the converter station

Enter the first minimization objective function respectively to obtain the reactive power adjustment amount ΔQ _g,0 of the new energy power plant unit.

Further, in this embodiment of the present disclosure, as shown in FIG. 5 , the adjustment unit 54 includes:

The calculation module 541 is configured to calculate the adjustment amount ΔV ^h _{s of} the high-voltage side busbar voltage of the new energy power plant according to the reactive power adjustment amount ΔQ _g,0 of the new energy power plant unit and the reactive power sensitivity information Sen ₀ of the new energy power plant unit, ₀ ;

The first update module 542 is configured to, according to the adjustment amount ΔV ^h _s,0 of the high-voltage side busbar voltage of the new energy power plant and the reactive power sensitivity information Sen ₀ of the new energy power plant unit, update the initial value of the new energy power plant unit at time T ₀ . Reactive to update;

The first cycle module 543 is used to obtain the updated data sections F _m,1 , F _m,1 of the new energy DC transmission end power grid according to the relevant information of the latest new energy DC transmission end grid initial data section F _m,0 As the new energy DC sending end grid data section at T ₀ +1 time, it provides data support for the next round of automatic voltage control, and realizes the automatic voltage control function in the AC network mode of the new energy DC sending end grid.

Further, in the embodiment of the present disclosure, as shown in FIG. 5 , when it is determined that the operation mode of the new energy DC transmission end power grid is the constant voltage control mode, the calculation unit 53 includes:

The second acquisition module 533 is configured to acquire the initial reactive power information Gen _0,q of the new energy power plant unit, the reactive power and voltage sensitivity information Sen ₀ of the new energy power plant unit, and the initial reactive power accumulation Gate _0,q at time T ₀ . ;

The second input module 534 is used for adding Gate ₀ the initial reactive power information Gen _0,q of the new energy power plant unit, the reactive power voltage sensitivity information Sen ₀ of the new energy power plant unit, and the initial reactive power accumulation at time T ₀ . _{, q} , input the second minimization objective function, and obtain the reactive power adjustment amount ΔQ _g,0 of the new energy power plant unit.

Further, in this embodiment of the present disclosure, as shown in FIG. 5 , the adjustment unit 54 includes:

The second update module 544 is configured to, according to the reactive power adjustment amount ΔQg _,0 pair of the new energy power plant unit and the reactive power sensitivity information Sen ₀ of the new energy power plant unit, update the initial non-reactive power of the new energy power plant unit at time T ₀ . The power and the voltage of the high-voltage side bus and the voltage information of the converter station bus are updated;

The second cycle module 545 is configured to obtain the updated data sections F _m,1 , F _m,1 of the new energy DC transmission end grid by adjusting the relevant information of the initial data section F _m,0 of the new energy DC transmission end power grid as the first The new energy DC sending end grid data section at time T ₀ +1 provides data support for the next round of automatic voltage control, and realizes the automatic voltage control function in the island mode of the new energy DC sending end grid.

Further, in the embodiment of the present disclosure, as shown in FIG. 5 , the device further includes:

The checking unit 55 is configured to periodically check the topology state of the power grid model of the new energy DC sending end power grid converter station with a preset control period T _c as a unit;

The circulation unit 56 is configured to use the data section _of the new energy direct current transmission end power grid at time T1 as the initial data section _of the T1 period to perform automatic voltage control in the next cycle.

It should be noted that, the foregoing explanations on the method embodiment are also applicable to the apparatus in this embodiment, and the principles are the same, and are not limited in this embodiment.

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

FIG. 6 shows a schematic block diagram of an example electronic device 600 that may 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, mainframe computers, and other suitable computers. Electronic devices may also represent various forms of mobile devices, such as personal digital processors, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are by way of example only, and are not intended to limit implementations of the disclosure described and/or claimed herein.

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

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

Computing unit 601 may be various general-purpose and/or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 601 include but are not limited to CPU (Central Processing Unit, central processing unit), GPU (Graphic Processing Units, graphics processing unit), various dedicated AI (Artificial Intelligence, artificial intelligence) computing chips, various running The computing unit of the machine learning model algorithm, DSP (Digital Signal Processor, digital signal processor), and any suitable processor, controller, microcontroller, etc. The computing unit 601 executes the various methods and processes described above, such as the method for reactive power and voltage control in the DC transmission end grid. For example, in some embodiments, a method of reactive voltage control in a DC transmission end grid may be implemented as a computer software program tangibly embodied on 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 on device 600 via ROM 602 and/or communication unit 609 . When a computer program is loaded into RAM 603 and executed by computing unit 601, one or more steps of the methods described above may be performed. Alternatively, in other embodiments, the computing unit 601 may be configured in any other suitable manner (eg, by means of firmware) to perform the aforementioned method of reactive voltage control in the DC sending end grid.

Various implementations of the systems and techniques described herein above may be implemented in digital electronic circuitry, integrated circuit systems, FPGAs (Field Programmable Gate Arrays), ASICs (Application-Specific Integrated Circuits) , ASSP (Application Specific Standard Product), SOC (System On Chip, System On Chip), CPLD (Complex Programmable Logic Device), computer hardware, firmware, software, and/or their implemented in combination. These various embodiments may include being implemented in one or more computer programs executable and/or interpretable on a programmable system including at least one programmable processor that The processor, which may be a special purpose or general-purpose programmable processor, may receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device an 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 code, when executed by the processor or controller, performs the functions/functions specified in the flowcharts and/or block diagrams. Action is implemented. The program code may execute entirely on the machine, partly on the machine, partly on the machine and partly on a remote machine as a stand-alone software package or entirely on the remote machine or server.

In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in connection with the instruction execution system, apparatus or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. Machine-readable media may include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media would include one or more wire-based electrical connections, portable computer disks, hard disks, RAM, ROM, EPROM (Electrically Programmable Read-Only-Memory) Or flash memory, optical fiber, CD-ROM (Compact Disc Read-Only Memory), optical storage device, magnetic storage device, or any suitable combination of the above.

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

The systems and techniques described herein may be implemented on a computing system that includes back-end components (eg, as a data server), or a computing system that includes middleware components (eg, an application server), or a computing system that includes front-end components (eg, a user computer having a graphical user interface or web browser through which a user may interact with implementations of the systems and techniques described herein), or including such backend components, middleware components, Or any combination of front-end components in a computing system. The components of the system may be interconnected by any form or medium of digital data communication (eg, a communication network). Examples of communication networks include: LAN (Local Area Network, Local Area Network), WAN (Wide Area Network, Wide Area Network), Internet, and blockchain networks.

A computer system can include clients and servers. Clients and servers are generally remote from each other and usually interact through a communication network. The relationship of client and server arises by computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also known as a cloud computing server or a cloud host. It is a host product in the cloud computing service system to solve the traditional physical host and VPS service ("Virtual Private Server", or "VPS" for short). , there are the defects of difficult management and weak business expansion. The server can also be a server of a distributed system, or a server combined with a blockchain.

Among them, it should be noted that artificial intelligence is the study of making computers to simulate certain thinking processes and intelligent behaviors (such as learning, reasoning, thinking, planning, etc.) Artificial intelligence hardware technologies generally include technologies such as sensors, dedicated artificial intelligence chips, cloud computing, distributed storage, and big data processing; artificial intelligence software technologies mainly include computer vision technology, speech recognition technology, natural language processing technology, and machine learning/depth Learning, big data processing technology, knowledge graph technology and other major directions.

It should be understood that steps may be reordered, added or deleted using the various forms of flow shown above. For example, the steps described in the present disclosure can be executed in parallel, sequentially, or in different orders. As long as the desired results of the technical solutions disclosed in the present disclosure can be achieved, there is no limitation herein.

The above-mentioned specific embodiments do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present disclosure should be included within the protection scope of the present disclosure.

Claims (21)

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

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.

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

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.

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;

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.

4. The method of claim 3, further comprising:

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

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

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

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 。

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:

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 。

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:

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.

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

11. The apparatus of claim 10, wherein 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 a new energy direct current transmission end power grid.

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

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.

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

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.

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

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 。

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:

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.

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.

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