CN113629766A

CN113629766A - Automatic voltage control method and device for reducing voltage fluctuation of new energy collection area

Info

Publication number: CN113629766A
Application number: CN202110925892.6A
Authority: CN
Inventors: 王建平; 吕晨旭; 郭亮; 李庆良; 郭保忠; 黄少波
Original assignee: Xinzhou Power Supply Co of State Grid Shanxi Electric Power Co Ltd
Current assignee: Xinzhou Power Supply Co of State Grid Shanxi Electric Power Co Ltd
Priority date: 2021-08-12
Filing date: 2021-08-12
Publication date: 2021-11-09
Anticipated expiration: 2041-08-12
Also published as: CN113629766B

Abstract

The disclosure relates to an automatic voltage control method and device for reducing voltage fluctuation of a new energy collection area, and belongs to the technical field of automatic voltage control of electric power systems. The method comprises the following steps: obtaining a basic state power flow calculation result of a new energy collection area in a power grid temporarily in each automatic voltage control period, and calculating the voltage sensitivity of active power injected into a high-voltage side bus of each new energy power station in the new energy collection area to each bus; calculating the predicted value of each bus voltage in the new energy collection area at each moment in the prediction time period by using the sensitivity; and calculating the upper limit and the lower limit of a voltage safety region of each bus in a prediction period according to the voltage prediction value for automatic voltage control of the prediction period. The utility model discloses a new energy power station collects regional electric wire netting suitable for concentrate and is incorporated into power networks, can just carry out preventative regulation to the reactive power equipment of electric wire netting before new energy electricity generation changes fast, has guaranteed the safety and stability of new energy collection district electric wire netting voltage.

Description

Automatic voltage control method and device for reducing voltage fluctuation of new energy collection area

Technical Field

The disclosure belongs to the technical field of automatic voltage control of electric power systems, and particularly relates to an automatic voltage control method and device for reducing voltage fluctuation of a new energy collection area.

Background

An Automatic Voltage Control (AVC) system is an important means for realizing safe (Voltage stability margin improvement), economic (network loss reduction) and high-quality (Voltage yield improvement) operation of a power transmission network. The AVC system is constructed on a power grid Energy Management System (EMS), can utilize real-time operation data of a power transmission network, scientifically decides an optimal reactive voltage regulation scheme from the perspective of global optimization of the power transmission network, and automatically issues the optimal reactive voltage regulation scheme to a power plant, a transformer substation and a subordinate power grid dispatching mechanism for execution. The architecture of automatic voltage control of a large power grid is described in "global voltage optimization control system design based on soft partitioning" (power system automation, 2003, volume 27, paragraph 8, pages 16-20) by grand son, zhenberging and guo celebration.

The main station part of the AVC system is realized in a power system control center based on software, and the voltage control strategies of the AVC system on a power transmission network mainly comprise a reactive power control strategy for each generator of a power plant and a reactive power equipment control strategy for a transformer substation, which are 2 types. The reactive power control strategy of each generator in the power plant adopts the following main modes at present: and after receiving the reactive adjustment quantity of the generator, the AVC substation of the power plant adjusts the reactive power sent by the generator in a stepping mode according to the current running state of each generator in the power plant until the adjustment quantity sent by the AVC main station is reached. The control strategy of the reactive equipment of the transformer substation is a switching instruction of the reactive compensation equipment, the reactive equipment mainly comprises a capacitor and a reactor, and when the capacitor is put into the reactive equipment or the reactor is cut off, the bus voltage is increased; when the capacitor is cut off or the reactor is put in, the bus voltage decreases. And the AVC master station issues an instruction for putting in or cutting off the reactive equipment, and an automatic monitoring system in the transformer substation finds the circuit breaker connected with the reactive equipment and switches on or off the circuit breaker according to the received instruction so as to complete the putting in or cutting off of the reactive equipment.

In order to realize the strategic goals of '2030 year carbon peak reaching and 2060 year carbon neutralization', the construction of a novel power system taking new energy as a main body is a necessary way for the power industry to promote self carbon emission reduction and support the whole society carbon emission reduction. New energy has become the preferred scheme that many conditional areas promote clean energy to replace, has formed new energy collection district, and its capacity of being incorporated into the power networks increases fast, brings new challenge for the dispatch operation of electric wire netting. On one hand, in some areas which are close to the load center, such as offshore areas of developed cities along the sea, wind exists all the year round, and the wind is very suitable for the active demand of the electric load center; on the other hand, a large-scale centralized development mode is adopted, reactive voltage support of conventional water and fire power plant units is lacked in a new energy centralized grid-connected area, the short-circuit capacity of a system is small, and large voltage fluctuation is caused by the inherent active power generation intermittence change of new energy, so that great difficulty is brought to voltage regulation and control.

In a new energy power generation area which is intensively collected and connected into a power grid in a large scale, a new energy power station cascading off-grid fault caused by overlarge voltage fluctuation is easy to occur, and the safe and stable operation of the whole power grid is further influenced. In order to solve the problem, on one hand, the reactive power regulation capability of the new energy station needs to be fully utilized to provide voltage support for new energy power generation; on the other hand, various reactive resources of the new energy station and the sending channel are reasonably regulated and controlled to realize coordination control.

Automatic Voltage Control (AVC) has been widely used in all levels of grid dispatch centers. In recent years, there have been many research results around the large-scale integration of new energy into the voltage control of the power grid. In guo qing, royal bin, grandson bin, in the "autonomous cooperative voltage control technology for supporting large-scale wind power centralized access" (power system automation, 2015, volume 39, phase 1, page 88-93), a technical system for supporting large-scale wind power centralized access autonomous cooperative voltage control is proposed, autonomous control is realized at a new energy power station level, and a new energy power station substation is used for coordinately controlling regulating devices with different time constants, such as a static reactive compensator, a static reactive generator, a wind turbine generator, a capacitive reactor and the like, so that voltage fluctuation caused by intermittent wind power output is suppressed; and realizing cooperative control at a system level, reducing voltage fluctuation through agile secondary voltage control which can be self-adaptive to wind power change under a normal condition, and ensuring a normal and safe running state of a collection region by using prevention control based on Safety Constraint Optimal Power Flow (SCOPF) when the risk of offline is high.

At present, the automatic voltage control system (AVC) operating in each level of power grid dispatching center mostly adopts periodic control (usually 5 minutes), and the control is performed by calculating data of one data section of the power grid. In a time period when the active power of new energy is high, a large amount of active power change is probably generated in the interval time of two times of control, so that an AVC system cannot respond in time, the bus voltage is caused to generate large fluctuation, and even a short-time out-of-limit condition is caused.

Due to the fact that a large-scale new energy collection area has strong intermittence, voltage fluctuation of a grid-connected area caused by active power output change or fault disturbance is severe, and linkage grid disconnection of new energy stations in the area can be caused. Therefore, the voltage safety operation domain of the new energy collection area needs to be determined through online voltage safety domain evaluation so as to meet the requirement that the voltage safety can be still ensured after the new energy power generation trend changes and the risk fault occurs in the future. Compared with the traditional AVC, a new energy collection area voltage safety evaluation module is added to part of the AVC at present, the module considers the power generation trend change of the new energy collection area for a period of time in the future, predicts the future voltage change trend according to the active power generation trend change, calculates the voltage static security domain of a large-scale new energy collection area, and namely adjusts the bus voltage limit range according to the voltage change trend prediction. The adjusted limit range is generally a subset of an originally manually set planned limit range and serves as a constraint condition for the third-level optimization and the second-level voltage control of AVC, and therefore voltage safety prevention control considering future voltage change trends and risk conditions of a large-scale new energy collection region is achieved.

Therefore, in order to reduce the large fluctuation of the bus voltage of the power grid caused by the inherent active power generation intermittence change of the new energy unit, when automatic voltage control is carried out, the active power of the new energy in the current new energy gathering area needs to be predicted, the change amplitude of the bus voltage in the near area, which is possibly caused by the change of the active power, is predicted, then the upper limit of the voltage safety domain and the lower limit of the voltage safety domain of each bus can be further calculated, voltage prevention control is carried out on the power grid in the near area according to the need, and therefore the fluctuation of the bus voltage entering the new energy gathering area is reduced, and the situation that the voltage of the power grid in the new energy gathering area exceeds the limit is avoided.

Disclosure of Invention

The purpose of the present disclosure is to provide an automatic voltage control method and apparatus for reducing voltage fluctuation in a new energy collection area to overcome the disadvantages of the prior art. The utility model discloses a new energy power station collects regional electric wire netting suitable for concentrate and is incorporated into power networks, can just carry out preventative regulation to the reactive power equipment of electric wire netting before new energy electricity generation changes fast, has guaranteed the safety and stability of new energy collection district electric wire netting voltage.

An embodiment of a first aspect of the present disclosure provides an automatic voltage control method for reducing voltage fluctuation of a new energy collection area, including:

acquiring a basic state load flow calculation result of a new energy collection area in the power grid temporarily in each automatic voltage control period;

calculating the voltage sensitivity of the high-voltage side bus injection active power of each new energy power station in the new energy collection area to each bus by using the ground state power flow calculation result;

calculating the predicted value of each bus voltage in the new energy collection area at each moment in a prediction time period by using the sensitivity;

and calculating the upper limit and the lower limit of a voltage safety region of each bus in the prediction period according to the predicted value of each bus voltage for automatic voltage control in the prediction period.

In an embodiment of the present disclosure, the calculation result of the ground-state power flow of the new energy collection area in the power grid includes:

the active power and the bus voltage value of each new energy power station in the new energy collection area;

the active power of each new energy power station forms an active power set U of each new energy power station_wstp＝(P₁，P₂，…，P_IAnd the bus voltage values form a bus voltage set U_wu＝{U₁,U₂,…,U_J}; i is the total number of new energy power stations contained in the new energy collection area, and J is the total number of buses contained in the new energy collection area.

In an embodiment of the disclosure, the calculating, by using the sensitivity, a predicted value of each bus voltage in the new energy collection area at each time within a prediction period includes:

1) let the prediction period be t₀To t₀+T₁Wherein, t₀Indicating the starting time of the prediction period, T₁Is the length of the prediction period;

2) let the current prediction time be x, and the initial value of x be t₀；

3) Determining an active power generation predicted value P of each new energy power station i in the new energy collection area at the moment x_i,xThe method comprises the following steps:

if x is coincident with the corresponding moment of any one of the new energy power station i in the day active power generation prediction initial values, taking the new energy power station i in the day active power generation prediction initial value corresponding to the x moment as the active power generation prediction value of the new energy power station i at the x moment; otherwise, linear interpolation of the active power generation prediction initial values of the two new energy power stations i adjacent to each other before and after the x moment in the current day is used as the active power generation prediction value of the new energy power station i at the x moment, and the expression is as follows:

wherein, the day active power generation prediction initial value D of the new energy power station i_i,nAcquiring N is 1, N is the serial number of an active power generation prediction initial value of a new energy power station from a power grid energy management system, and v is a time interval between adjacent prediction initial values; x/v represents the integer result of dividing x by v, and x% v represents the remainder result of dividing x by v;

4) establishing an active power generation predicted value vector F of all new energy power stations at the x moment by using the result of the step 3)_x＝[P_1,xP_2,x…P_I,x]；

According to set U_wstpForm a corresponding vector F ═ P₁P₂…P_I]Calculating the active power change value vector delta F of each new energy power station at the time x_x＝F_x-F＝[P_1,x-P₁ P_2,x-P₂…P_I,x-P_I]；

5) Calculating voltage change value vector delta U of each bus at the time x_x＝ΔF_x*S_cv＝[ΔU_1,xΔU_2,x…ΔU_J,x]According to the set U_wu＝{U₁,U₂,…,U_JV. formed voltage vector U₀＝[U₁U₂…U_J]Obtaining a vector formed by predicted values of the bus voltages at the x moment as U_x＝U₀+ΔU_xWherein U is_x＝[U₁+ΔU_1,xU₂+ΔU_2,x…U_J+ΔU_J,x]＝[U_1,xU_2,x…U_J,x]；

Wherein S is_cvFor the sensitivity matrix:

wherein S is_ijHigh-voltage side bus represented in ith new energy power stationVoltage sensitivity of upper injection to jth bus;

6) making x equal to x +1, and then returning to the step 3); until the current prediction time is t₀+T₁Obtaining the predicted value of each bus voltage of the new energy collection area at all times in the prediction time period, and constructing the predicted value at (t)₀,t₀+T₁) The method comprises the following steps of (1) collecting the predicted values of all bus voltages in a time interval new energy collection area:

in one embodiment of the present disclosure, the calculating, according to the each bus voltage predicted value, a voltage safety region upper limit and a voltage safety region lower limit of the each bus in the prediction period for automatic voltage control of the prediction period includes:

1) let t be the prediction period (t)₀,t₀+T₁) Any time within;

for each bus j, an initial value Δ U is set_t.inc,j＝0，ΔU_t.dec,j0; wherein Δ U_t.inc,jRepresenting the maximum amplitude, Δ U, of the continuous increase in the voltage of bus j during the prediction period starting from time t_t.dec,jRepresents the maximum amplitude of the continuous reduction of the voltage of the bus j in the prediction period from the moment t;

2) from the time point of x-t +1, Δ U is calculated_t.inc,jThe final value of (A) is as follows:

2-1) from U_j＝{U_j,x,x＝t₀,...,t₀+T₁Respectively obtaining voltage predicted values U of a bus j at x and x-1 moments_j,x、U_j,x-1Calculating the voltage variation DeltaU between the two predicted values_j,x＝U_j,x-U_j,x-1(ii) a Wherein, U_jRepresenting bus j in the prediction period (t)₀,t₀+T₁) A set of predicted voltage values at each time;

2-2) to Delta U_j,xAnd (4) judging:

2-2-1) if Δ U_j,xIf greater than 0, let Δ U_t.inc,j＝ΔU_t.inc,j+ΔU_j,x；

And (3) judging x: if x<t₀+T₁If x is x +1, returning to step 2-1); if x is greater than or equal to t₀+T₁If so, the calculation is finished and the current delta U_t.inc,jNamely the final value of the maximum amplitude value of the voltage of the bus j continuously increasing in the prediction time period from the moment t;

2-2-2) if Δ U_j，xIf the current value is less than or equal to 0, the calculation is ended, and the current delta U is_t.inc,jNamely the final value of the maximum amplitude value of the voltage of the bus j continuously increasing in the prediction time period from the moment t;

3) from the time point of x-t +1, Δ U is calculated_t.dec,jThe final value of (A) is as follows:

3-1) from U_j＝{U_j,x,x＝t₀,...,t₀+T₁Respectively obtaining voltage predicted values U of a bus j at x and x-1 moments_j,x、U_j,x-1Calculating the voltage variation DeltaU between the two predicted values_j,x＝U_j,x-U_j,x-1(ii) a Wherein, U_jRepresenting bus j in the prediction period (t)₀,t₀+T₁) A set of predicted voltage values at each time;

3-2) to Delta U_j,xAnd (4) judging:

3-2-1) if Δ U_j,xIf < 0, let Δ U_t.dec,j＝ΔU_t.dec,j+ΔU_j,x；

And (3) judging x: if x<t₀+T₁If x is x +1, returning to the step 3-1); if x is greater than or equal to t₀+T₁If so, the calculation is finished and the current delta U_t.dec,jThat is, the voltage of the bus j is at (t) from the time t₀,t₀+T₁) A final value of a maximum amplitude at which successive reductions occur in the predicted period of time;

3-2-2) if Δ U_j，xIf the current delta U is more than or equal to 0, the calculation is ended and the current delta U is_t.dec,jThat is, the voltage of the bus j is at (t) from the time t₀,t₀+T₁) A final value of a maximum amplitude at which successive reductions occur in the predicted period of time;

4) repeating the steps 2) to 3) to obtain (t)₀,t₀+T₁) Delta U corresponding to each time t in time interval_t.inc,jAnd Δ U_t.dec,jCalculating the value of each bus j at (t)₀,t₀+T₁) The upper voltage safety range limit and the lower voltage safety range limit in the time period are as follows:

in the formula (I), the compound is shown in the specification,

upper and lower limits are planned for the voltage of bus j, respectively.

An embodiment of a second aspect of the present disclosure provides an automatic voltage control apparatus for reducing voltage fluctuation of a new energy collection area, including:

the ground state power flow calculation module is used for acquiring a ground state power flow calculation result of a new energy collection area in the power grid temporarily in each automatic voltage control period;

the sensitivity calculation module is used for calculating the voltage sensitivity of the high-voltage side bus injection active power of each new energy power station in the new energy collection area to each bus by using the ground state power flow calculation result;

the voltage prediction module is used for calculating the predicted value of each bus voltage in the new energy collection area at each moment in the prediction time period by using the sensitivity;

and the voltage safety zone calculation module is used for calculating the voltage safety zone upper limit and the voltage safety zone lower limit of each bus in the prediction time zone according to each bus voltage prediction value so as to be used for automatic voltage control in the prediction time zone.

An embodiment of a third aspect of the present disclosure provides an electronic device, including:

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 configured to perform one of the above-described automatic voltage control methods of reducing new energy collection area voltage fluctuations.

A fourth aspect of the present disclosure is directed to a computer-readable storage medium storing computer instructions for causing a computer to execute the above-mentioned automatic voltage control method for reducing voltage fluctuation of a new energy collection area.

The characteristics and the beneficial effects of the disclosure are as follows:

the method is suitable for the new energy power station convergence regional power grid which is centrally connected with the grid, the voltage of the regional power grid can fluctuate greatly along with the intermittent characteristic of new energy power generation, and in order to solve the problem, when each automatic voltage control period comes, obtaining active power generation power prediction data of the new energy station, further calculating to obtain a voltage predicted value of each bus in the new energy collection area in a future period of time, then the upper limit of the voltage safety domain and the lower limit of the voltage safety domain of each bus can be further calculated and input into an automatic voltage control system to realize preventive control, therefore, the reactive power equipment of the power grid can be regulated in a preventive manner before the new energy power generation changes rapidly, therefore, the fluctuation range of the voltage is reduced, the risk of out-of-limit of the power grid voltage is reduced, and the safety and stability of the power grid voltage of the new energy collection area are ensured.

Drawings

Fig. 1 is an overall flowchart of an automatic voltage control method for reducing voltage fluctuation in a new energy collection area according to an embodiment of the present disclosure.

Detailed Description

An embodiment of the first aspect of the disclosure provides an automatic voltage control method for reducing voltage fluctuation of a new energy collection area, where an overall process is shown in fig. 1, and the method includes the following steps:

(1) setting an automatic voltage control period T (T is usually 5 minutes) of the power grid;

(2) when each control period T comes, a current ground state power flow calculation result of the power grid is obtained from a power grid Energy Management System (EMS) system.

Recording that the new energy collection area contains I new energy power stations, then the new energy power stations are integrated into a U_wst＝{W₁,W₂,…,W_IIn which W is_iRepresents the ith new energy power station, I is 1,2, …, I; if the region contains J buses, the bus set U is recorded_wbs＝{B₁,B₂,…,B_JThe station comprises a booster station bus, a switch station bus and a collection station bus of each new energy power station, wherein B_jRepresents the J-th bus, J is 1,2, …, J,. Obtaining the active power of each new energy power station in the ground state tide to form an active power set U of each new energy power station_wstp＝[P₁，P₂，…，P_IIn which P is_iRepresents the ith new energy power station W_iActive power value of (1). Obtaining the voltage value of each bus in the ground state tide to form a bus voltage set U_wu＝{U₁,U₂,…,U_JIn which U is_jRepresentative bus bar B_jThe voltage value of (2).

(3) Calculating to obtain the voltage sensitivity S of the high-voltage side bus injection active power of each new energy power station in the new energy collection area to each bus in the collection area based on the ground state power flow calculation result obtained in the step (2)_ij，S_ijThe voltage variation of the jth bus in the corresponding new energy collection area is expressed by injecting unit active power on the high-voltage side bus of the ith new energy power station. All S are obtained according to all new energy power stations and collection substations of the new energy collection area_ijAnd forming an I x J order sensitivity matrix as follows:

wherein is S_cvSensitivity matrix, S_ijAnd active power injection on a high-voltage side bus of the ith new energy power station has voltage sensitivity of a jth bus in the unit of kV/WM.

(4) Obtaining the current day active power generation prediction initial value D of any new energy power station i from the EMS system_i,nN is active power generation of new energy power stationThe sequence number of the electrical prediction initial value, wherein v is a time interval between adjacent prediction initial values, generally v is 15 minutes, and N is 96; i represents the ith new energy power station, I is 1,2, …, I. The prediction initial value may be from a short-term new energy power generation prediction before the day or from an ultra-short-term new energy power generation prediction within the day.

(5) Calculating the predicted value of each bus voltage of the new energy collection area at each moment in the prediction time period;

let the prediction period be t₀To t₀+T₁Wherein, t₀Indicating the starting time of the prediction period, T₁Is the length of the prediction period; in this embodiment, t is set₀T is set to indicate the number of minutes from the current day 0 to the current time₁Predicting the number of minutes of the future period for the roll (T1 typically takes 30 minutes); calculating the current time t₀To t₀+T₁Predicted value U of bus voltage of each new energy collection area per minute in time interval_i,tThe method comprises the following specific steps:

(5-1) setting the current prediction time as x, wherein x is in (t)₀,t₀+T₁) Within the range, let x have an initial value of t₀；

(5-2) determining the active power generation predicted value P of the new energy power station i at the moment x for each new energy power station i in the new energy collection area_i,xThe method comprises the following steps:

wherein x/v represents the integer result of dividing x by v, and x% v represents the remainder result of dividing x by v.

(5-3) obtaining the active power generation predicted value of all the new energy power stations at the time x by using the result of the step (5-2), and forming an active power generation predicted value vector F of all the new energy power stations at the time x_x＝[P_1,x P_2,x…P_I,x]；

According to set U_wstpForm a corresponding vector F ═ P₁ P₂…P_I]Calculating the active power change value vector delta F of each new energy power station at the time x_x＝F_x-F＝[P_1,x-P₁ P_2,x-P₂…P_I,x-P_I]。

(5-4) according to the vector Δ F_xAnd a sensitivity matrix S_cvThe voltage variation value vector delta U of each bus at the time x is calculated_x＝ΔF_x*S_cv＝[ΔU_1,x ΔU_2,x…ΔU_J,x]According to the set U_wu＝{U₁,U₂,…,U_JV. formed voltage vector U₀＝[U₁ U₂…U_J]Obtaining a vector formed by predicted values of the bus voltages at the x moment as U_x＝U₀+ΔU_xWherein U is_x＝[U₁+ΔU_1,x U₂+ΔU_2,x…U_J+ΔU_J,x]＝[U_1,x U_2,x…U_J,x]

(5-5) making x be x +1, then returning to the step (5-2), and calculating the predicted value of each bus voltage of the new energy collection area at the next prediction time until the current prediction time is t₀+T₁Obtaining the predicted value of each bus voltage of the new energy collection area at all times in the prediction time period, and constructing the predicted value at (t)₀,t₀+T₁) The method comprises the following steps of (1) collecting the predicted values of all bus voltages in a time interval new energy collection area:

(6) calculating the upper limit and the lower limit of a voltage safety region of each bus in a prediction time period in the new energy collection region;

in this embodiment, step (5) obtains a voltage predicted value U of each bus j of the new energy collection area at each time of the prediction time period_j＝{U_j,x,x＝t₀,...,t₀+T₁The upper limit of the voltage safety region of each bus j can be further calculated

And voltage safety margin lower limit

The method comprises the following specific steps:

(6-1) setting t to (t)₀,t₀+T₁) At any time, an initial value Δ U is set_t.inc,j＝0，ΔU_t.dec,j0; wherein Δ U_t.inc,jRepresenting the maximum amplitude, Δ U, of the continuous increase in the voltage of bus j during the prediction period starting from time t_t.dec,jRepresenting the maximum magnitude at which the voltage of bus j decreases continuously over the prediction period from time t.

(6-2) calculating Δ U from the time when x ═ t +1_t.inc,jThe final value of (A) is as follows:

(6-2-1) from U_jRespectively obtaining voltage predicted values U of a bus j at x and x-1 time_j,x、U_j,x-1Calculating the voltage variation DeltaU between the two predicted values_j,x＝U_j,x-U_j,x-1；

(6-2-2) vs. Δ U_j,xAnd (4) judging:

(6-2-2-1) if.DELTA.U_j,xIf greater than 0, let Δ U_t.inc,j＝ΔU_t.inc,j+ΔU_j,x；

Then, x is determined: if x<t₀+T₁If x is x +1, returning to the step (6-2-1); if x is greater than or equal to t₀+T₁If so, the calculation is finished and the current delta U_t.inc,jThat is, the voltage of the bus j is at (t) from the time t₀,t₀+T₁) A final value of a maximum amplitude of the predicted period of time of occurrence of the continuous increase;

(6-2-2-2) if.DELTA.U_j，xIf the current value is less than or equal to 0, the calculation is ended, and the current delta U is_t.inc,jThat is, the voltage of the bus j is at (t) from the time t₀,t₀+T₁) A final value of a maximum amplitude of the predicted period of time of occurrence of the continuous increase; (6-3) calculating Δ U from the time when x ═ t +1_t.dec,jThe final value of (A) is as follows:

(6-3-1) from U_j＝{U_j,x,x＝t₀,...,t₀+T₁Respectively obtaining voltage predicted values U of a bus j at x and x-1 moments_j,x、U_j,x-1Calculating the voltage variation DeltaU between the two predicted values_j,x＝U_j,x-U_j,x-1(ii) a Wherein, U_jRepresenting bus j in the prediction period (t)₀,t₀+T₁) A set of predicted voltage values at each time;

(6-3-2) vs. Δ U_j,xAnd (4) judging:

(6-3-2-1) if.DELTA.U_j,xIf < 0, let Δ U_t.dec,j＝ΔU_t.dec,j+ΔU_j,x；

Then, x is determined: if x<t₀+T₁If x is x +1, repeat step (6-3-1) to update Δ U_j,x(ii) a If x is greater than or equal to t₀+T₁If so, the calculation is finished and the current delta U_t.dec,jThat is, the voltage of the bus j is at (t) from the time t₀,t₀+T₁) A final value of a maximum amplitude at which successive reductions occur in the predicted period of time;

(6-3-2-2) if.DELTA.U_j，xIf the current delta U is more than or equal to 0, the calculation is ended and the current delta U is_t.dec,jThat is, the voltage of the bus j is at (t) from the time t₀,t₀+T₁) A final value of a maximum amplitude at which successive reductions occur in the predicted period of time;

(6-4) repeating the steps (6-2) to (6-3) to obtain (t)₀,t₀+T₁) Delta U corresponding to each time t in time interval_t.inc,jAnd Δ U_t.dec,jCalculating each bus j in (t) considering the voltage trend₀,t₀+T₁) The upper voltage safety range limit and the lower voltage safety range limit in the time period are as follows:

wherein t is t₀,…,t₀+T₁For the predicted time of each minute,

upper and lower limits are planned for the voltage of bus j previously manually programmed, respectively.

It should be noted that the voltage safety domain upper limit and the voltage safety domain lower limit of each bus obtained by the above calculation are only applicable to the prediction period (t)₀,t₀+T₁) When the next prediction period comes, the upper limit of the voltage safety domain and the lower limit of the voltage safety domain of each bus are required to be recalculated.

(7) And (4) inputting the upper limit and the lower limit of the voltage safety domain of each bus of the new energy collection region in the prediction period obtained by the calculation in the step (6) into an automatic voltage control module of a dispatching monitoring system of a power grid dispatching center, and issuing corresponding control instructions to a near-region power plant and a transformer substation to be executed by the automatic voltage control module, so that the voltage fluctuation of the new energy collection region in the prediction period is reduced, and the safe and stable operation of the voltage is guaranteed.

In order to achieve the above embodiments, an embodiment of a second aspect of the present disclosure provides an automatic voltage control apparatus for reducing voltage fluctuation of a new energy collection area, including:

To achieve the above embodiments, an embodiment of a third aspect of the present disclosure provides an electronic device, including:

To achieve the foregoing embodiments, a fourth aspect of the present disclosure provides a computer-readable storage medium storing computer instructions for causing a computer to execute the foregoing automatic voltage control method for reducing new energy collection area voltage fluctuation.

It should be noted that the computer readable medium in the present disclosure can be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present disclosure, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In contrast, in the present disclosure, a computer readable signal medium may comprise a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: electrical wires, optical cables, RF (radio frequency), etc., or any suitable combination of the foregoing.

The computer readable medium may be embodied in the electronic device; or may exist separately without being assembled into the electronic device. The computer readable medium carries one or more programs which, when executed by the electronic device, cause the electronic device to perform the automatic voltage control method for reducing new energy collection area voltage fluctuation of the above embodiments.

Computer program code for carrying out operations for aspects of the present disclosure may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + +, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.

The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware that is related to instructions of a program, and the program may be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. An automatic voltage control method for reducing voltage fluctuation of a new energy collection area is characterized by comprising the following steps:

2. The method of claim 1, wherein the calculation of the ground state power flow of the new energy collection area in the power grid comprises:

the active power of each new energy power station forms an active power set U of each new energy power station_wstp＝{P₁，P₂，…，P_IAnd the bus voltage values form a bus voltage set U_wu＝{U₁,U₂,…,U_J}; i is the total number of new energy power stations contained in the new energy collection area, and J is the total number of buses contained in the new energy collection area.

3. The method according to claim 2, wherein the calculating, by using the sensitivity, each bus voltage prediction value in the new energy collection area at each time within a prediction period comprises:

2) let the current prediction time be x, and the initial value of x be t₀；

wherein, the day active power generation prediction initial value D of the new energy power station i_i,nObtaining, from a grid energy management system, nN, N is a serial number of an active power generation prediction initial value of a new energy power station, and v is a time interval between adjacent prediction initial values; x/v represents the integer result of dividing x by v, and x% v represents the remainder result of dividing x by v;

According to set U_wstpForm a corresponding vector F ═ P₁ P₂…P_I]Calculating the active power change value vector delta F of each new energy power station at the time x_x＝F_x-F＝[P_1,x-P₁ P_2,x-P₂…P_I,x-P_I]；

5) Calculating voltage change value vector delta U of each bus at the time x_x＝ΔF_x*S_cv＝[ΔU_1,x ΔU_2,x…ΔU_J,x]According to the set U_wu＝{U₁,U₂,…,U_JV. formed voltage vector U₀＝[U₁ U₂…U_J]Obtaining a vector formed by predicted values of the bus voltages at the x moment as U_x＝U₀+ΔU_xWherein U is_x＝[U₁+ΔU_1,x U₂+ΔU_2,x…U_J+ΔU_J,x]＝[U_1,x U_2,x…U_J,x]；

Wherein S is_cvFor the sensitivity matrix:

wherein S is_ijIndicating the voltage sensitivity of the j-th bus injected on the high-voltage side bus of the ith new energy power station;

4. the method of claim 3, wherein said calculating a voltage safety range upper limit and a voltage safety range lower limit for said prediction period for said bus based on said bus voltage prediction values comprises:

1) let t be the prediction period (t)₀,t₀+T₁) Any time within;

2-2) to Delta U_j,xAnd (4) judging:

2-2-1) if Δ U_j,xIf greater than 0, let Δ U_t.inc,j＝ΔU_t.inc,j+ΔU_j,x；

And (3) judging x: if x<t₀+T₁If x is x +1, returning to step 2-1);if x is greater than or equal to t₀+T₁If so, the calculation is finished and the current delta U_t.inc,jNamely the final value of the maximum amplitude value of the voltage of the bus j continuously increasing in the prediction time period from the moment t;

3-2) to Delta U_j,xAnd (4) judging:

3-2-1) if Δ U_j,xIf < 0, let Δ U_t.dec,j＝ΔU_t.dec,j+ΔU_j,x；

in the formula (I), the compound is shown in the specification,

upper and lower limits are planned for the voltage of bus j, respectively.

5. An automatic voltage control device for reducing voltage fluctuation of a new energy collection area is characterized by comprising:

6. An electronic device, comprising:

wherein the memory stores instructions executable by the at least one processor, the instructions being arranged to perform the method of any of the preceding claims 1-4.

7. A computer-readable storage medium storing computer instructions for causing a computer to perform the method of any one of claims 1-4.