CN105449715A - Reactive voltage control method and device for wind power plants - Google Patents

Abstract

The embodiment of the invention provides a reactive voltage control method and device for wind power plants. The method comprises the steps as follows: AVC sub-stations of various wind power plants carry out modeling on respective wind power plants respectively, analyze reactive voltage regulation capabilities of respective wind power plants according to modeling, and report the analyzed reactive voltage regulation capabilities to an AVC master station of a regulation and control center; the AVC sub-stations of the wind power plants receive reactive voltage constant-value commands which are transmitted to the AVC sub-stations of the wind power plants by the AVC master station of the regulation and control center respectively; the reactive voltage constant-value commands are calculated by the AVC master station of the regulation and control center according to the reactive voltage regulation capabilities of the wind power plants; and the AVC sub-stations of the wind power plants regulate reactive voltages of the wind power plants according to respective reactive voltage constant-value commands. According to the reactive voltage control method and device for the wind power plants, the technical problems that the workload of data maintenance of an EMS system of the regulation and control center is extremely heavy and the data handling capacity of an SCADA system of the regulation and control center is in the face of a great test are solved.

Description

The reactive voltage control method of wind energy turbine set and device

Technical field

The present invention relates to power safety technique field, particularly a kind of reactive voltage control method of wind energy turbine set and device.

Background technology

The single-machine capacity of current Wind turbines is still relatively little, and Large Scale Offshore Wind Farm is generally by tens of, and even up to a hundred wind turbine generator form.Typically, Large Scale Offshore Wind Farm boosts to 10 or 35kV by tens of or up to a hundred 690V Wind turbines through box change, is collected to marine boosting becomes through 10 or 35kV current collection circuit, and through power transmission sequence feed-in electrical network after boosting to 110 or 220kV.

For conventional power plant, due to the unit negligible amounts in power plant, the SCADA system measuring and deliver to regulation and control center all such as to exert oneself of each unit, the EMS system at regulation and control center carries out detailed modeling to power plant, and AVC system is also direct using the idle voltage and reactive power optimization calculating participating in the whole network as variable of unit.

The installed capacity of single wind energy turbine set is relatively little, and each wind energy turbine set is again by tens of, even up to a hundred wind turbine generator compositions, if the detailed modeling that will realize to all wind energy turbine set in the EMS system of regulation and control center, the workload of its data maintenance will be extremely huge.In addition, if deliver to regulation and control center SCADA system by the measurement information of platform wind turbine generator every in each wind energy turbine set, also will be great test to the data-handling capacity of SCADA system.

Summary of the invention

Embodiments provide a kind of reactive voltage control method of wind energy turbine set, if to solve in prior art the detailed modeling that will realize in the EMS system of regulation and control center all wind energy turbine set, the workload of its data maintenance will be extremely huge; Regulation and control center SCADA system is delivered to, to the technical problem that the data-handling capacity of SCADA system also will be test greatly by the measurement information of platform wind turbine generator every in each wind energy turbine set.The method comprises: modeling is carried out to the wind energy turbine set at self place respectively in the AVC substation of each wind energy turbine set, and according to the reactive voltage regulating power of modeling analysis self place wind energy turbine set, will the reactive voltage regulating power obtained be analyzed report the AVC main website at regulation and control center; The AVC substation of each wind energy turbine set receives the reactive voltage constant value command being sent to respective wind energy turbine set AVC substation by the AVC main website at regulation and control center respectively, and described reactive voltage constant value command is calculated according to the reactive voltage regulating power of each wind energy turbine set by the AVC main website at regulation and control center; The AVC substation of each wind energy turbine set is according to the reactive voltage of self place wind energy turbine set of respective reactive voltage constant value command adjustment.

In one embodiment, before modeling is carried out to the wind energy turbine set at self place respectively in the AVC substation of each wind energy turbine set, also comprise: in each wind energy turbine set, the high-pressure side of step-up transformer is unit by the EMS equivalence regulating and controlling center.

In one embodiment, the AVC substation of each wind energy turbine set is according to the reactive voltage of self place wind energy turbine set of respective reactive voltage constant value command adjustment, comprise: the traffic coverage of reactive voltage is divided into place of safety, pre-police region and security area, respectively different penalty coefficients is arranged to place of safety, pre-police region and security area; The penalty coefficient of adjustment place of safety, in advance police region and security area, the reactive voltage of adjustment wind energy turbine set meets reactive voltage constant value command.

In one embodiment, by the reactive voltage of following formula adjustment wind energy turbine set:

$\begin{array}{c}\min Obj\left(e,f,U,B,T,Q_G\right)+w\underset{i\&Element;S_N}{\&Sigma;}{s}_i\\ s.t.\\ \left\{\begin{array}{cc}{P}_{Gi}-P_{Li}-\underset{j\&Element;S_N}{\&Sigma;}{P}_{ij}\left(e,f,U,B,T\right)=0& i\&Element;S_N\\ Q_{Gi}-Q_{Li}-\underset{j\&Element;S_N}{\&Sigma;}{Q}_{ij}\left(e,f,U,B,T\right)=0& i\&Element;S_N\\ U_i-e_i^2-f_i^2=0& i\&Element;S_N\\ {\underset{\&OverBar;}{Q}}_{Gi}<Q_{Gi}<{\stackrel{\&OverBar;}{Q}}_{Gi}& i\&Element;S_G\\ {({\underset{\&OverBar;}{V}}_{ci}-s_i)}^2<U_i<{({\stackrel{\&OverBar;}{V}}_{ci}+s_i)}^2& i\&Element;S_N\\ {\underset{\&OverBar;}{B}}_i<B_i<{\stackrel{\&OverBar;}{B}}_i& i\&Element;S_C\\ {\underset{\&OverBar;}{T}}_k<T_k<{\stackrel{\&OverBar;}{T}}_k& k\&Element;S_T\\ e_{ck}{T}_k=e_{jk}& k\&Element;S_T\\ f_{ck}{T}_k=f_{jk}& k\&Element;S_T\end{array}\right.\end{array}$

Wherein, Obj (e, f, U, B, T, Q _g) represent target function; the active power that node i flows out through adjacent legs; it is the reactive power that node i flows out through adjacent legs; Q _giit is the idle injection of node i unit; q _giit is the idle injection lower limit of node i unit; it is the idle injection upper limit of node i unit; B _iit is node i shunt compensation susceptance; b _iit is node i shunt compensation susceptance lower limit; it is the node i shunt compensation susceptance upper limit; T _kit is the mark no-load voltage ratio of on-load voltage regulation winding k; t _kit is the mark no-load voltage ratio lower limit of on-load voltage regulation winding k; it is the mark no-load voltage ratio upper limit of on-load voltage regulation winding k; e _ckit is the voltage real part of on-load voltage regulation winding k intermediate virtual point; e _jkit is the voltage real part of on-load voltage regulation winding k endpoint node j; f _ckit is the voltage imaginary part of on-load voltage regulation winding k intermediate virtual point; f _jkit is the voltage imaginary part of on-load voltage regulation winding k endpoint node j; for the upper voltage limit after compression; v _cifor the lower voltage limit after compression; s _ifor the slack that node i is introduced, represent the out-of-limit amount of node voltage; W represents in target function the penalty coefficient that voltage out-of-limit is punished; U _irepresent node i voltage magnitude square; v _irepresent the voltage magnitude lower limit of node i; represent the voltage magnitude upper limit of node i; e _irepresent the voltage phasor real part of node i; f _irepresent the voltage phasor imaginary part of node i; P _girepresent that the power supply of node i is meritorious to inject; P _lirepresent the burden with power of node i; Q _lirepresent the load or burden without work of node i; S _nfor the set of all topology points; S _gby the set of organic end topology point; S _cfor the set of shunt compensation equipment; S _tfor the set of transformer on-load voltage regulating tap.

In one embodiment, also comprise: corrected by the reactive voltage of following formula to each wind energy turbine set:

$\begin{array}{c}\min f({\mathrm{\&Delta;Q}}_G,\mathrm{\&Delta;}V,S)\\ s.t.\left\{\begin{array}{c}{\mathrm{\&Delta;Q}}_G=B\mathrm{\&Delta;}V\\ \begin{array}{cc}\mathrm{\&Delta;}{\underset{\&OverBar;}{Q}}_{Gi}<{\mathrm{\&Delta;Q}}_{Gi}<\mathrm{\&Delta;}{\stackrel{\&OverBar;}{Q}}_{Gi}& i\&Element;S_G\end{array}\\ \begin{array}{cc}\mathrm{\&Delta;}{\underset{\&OverBar;}{V}}_i^c-S<{\mathrm{\&Delta;V}}_i<\mathrm{\&Delta;}{\stackrel{\&OverBar;}{V}}_i^c+S& i\&Element;S_N\end{array}\\ S\&GreaterEqual;0\end{array}\right.\end{array}$

Wherein, B is the matrix that each element imaginary part of admittance matrix is formed, and has identical openness structure with admittance matrix; Δ Q _gfor the total idle injection variable quantity of topological point source; Target function f (Δ Q _g, Δ V, S) and be taken as positive semidefinite quadratic function; S _nfor the set of all topology points; S _gby the set of organic end topology point; Δ V is change in voltage vector; Δ Q _giit is the idle injection change vector of unit; Δ q _giit is unit idle injection change lower limit vector; it is unit idle injection change upper limit vector; S is slack variable; Δ V _iit is the voltage variety of node i; it is the permission change in voltage lower limit after node i compression; it is the permission change in voltage upper limit after node i compression.

The embodiment of the present invention additionally provides a kind of reactive power/voltage control device of wind energy turbine set, if to solve in prior art the detailed modeling that will realize in the EMS system of regulation and control center all wind energy turbine set, the workload of its data maintenance will be extremely huge; Regulation and control center SCADA system is delivered to, to the technical problem that the data-handling capacity of SCADA system also will be test greatly by the measurement information of platform wind turbine generator every in each wind energy turbine set.This device comprises: modeling analysis module, for carrying out modeling to the wind energy turbine set at self place, AVC substation, and according to the reactive voltage regulating power of modeling analysis self place wind energy turbine set, will the reactive voltage regulating power obtained be analyzed report the AVC main website at regulation and control center; Receiver module, for receiving the reactive voltage constant value command being sent to respective wind energy turbine set AVC substation by the AVC main website at regulation and control center, described reactive voltage constant value command is calculated according to the reactive voltage regulating power of each wind energy turbine set by the AVC main website at regulation and control center; Voltage control module, for each wind energy turbine set AVC substation according to respective reactive voltage constant value command adjustment self place wind energy turbine set reactive voltage.

In one embodiment, before modeling is carried out to the wind energy turbine set at self place respectively in the AVC substation of each wind energy turbine set, in each wind energy turbine set, the high-pressure side of step-up transformer is unit by the EMS equivalence regulating and controlling center.

In one embodiment, described voltage control module, comprising: division unit, for the traffic coverage of reactive voltage being divided into place of safety, pre-police region and security area, arranges different penalty coefficients respectively to place of safety, pre-police region and security area; Control unit, for adjusting the penalty coefficient of place of safety, in advance police region and security area, the reactive voltage of adjustment wind energy turbine set meets reactive voltage constant value command.

In one embodiment, described control unit, the reactive voltage especially by following formula adjustment wind energy turbine set:

$\begin{array}{c}\min Obj\left(e,f,U,B,T,Q_G\right)+w\underset{i\&Element;S_N}{\&Sigma;}{s}_i\\ s.t.\\ \left\{\begin{array}{cc}{P}_{Gi}-P_{Li}-\underset{j\&Element;S_N}{\&Sigma;}{P}_{ij}\left(e,f,U,B,T\right)=0& i\&Element;S_N\\ Q_{Gi}-Q_{Li}-\underset{j\&Element;S_N}{\&Sigma;}{Q}_{ij}\left(e,f,U,B,T\right)=0& i\&Element;S_N\\ U_i-e_i^2-f_i^2=0& i\&Element;S_N\\ {\underset{\&OverBar;}{Q}}_{Gi}<Q_{Gi}<{\stackrel{\&OverBar;}{Q}}_{Gi}& i\&Element;S_G\\ {({\underset{\&OverBar;}{V}}_{ci}-s_i)}^2<U_i<{({\stackrel{\&OverBar;}{V}}_{ci}+s_i)}^2& i\&Element;S_N\\ {\underset{\&OverBar;}{B}}_i<B_i<{\stackrel{\&OverBar;}{B}}_i& i\&Element;S_C\\ {\underset{\&OverBar;}{T}}_k<T_k<{\stackrel{\&OverBar;}{T}}_k& k\&Element;S_T\\ e_{ck}{T}_k=e_{jk}& k\&Element;S_T\\ f_{ck}{T}_k=f_{jk}& k\&Element;S_T\end{array}\right.\end{array}$

Wherein, Obj (e, f, U, B, T, Q _g) represent target function; the active power that node i flows out through adjacent legs; it is the reactive power that node i flows out through adjacent legs; Q _giit is the idle injection of node i unit; q _giit is the idle injection lower limit of node i unit; it is the idle injection upper limit of node i unit; B _iit is node i shunt compensation susceptance; b _iit is node i shunt compensation susceptance lower limit; B _ibe; it is the node i shunt compensation susceptance upper limit; T _kit is the mark no-load voltage ratio of on-load voltage regulation winding k; t _kbeing the mark no-load voltage ratio lower limit of on-load voltage regulation winding k is; it is the mark no-load voltage ratio upper limit of on-load voltage regulation winding k; e _ckit is the voltage real part of on-load voltage regulation winding k intermediate virtual point; e _jkit is the voltage real part of on-load voltage regulation winding k endpoint node j; f _ckit is the voltage imaginary part of on-load voltage regulation winding k intermediate virtual point; f _jkit is the voltage imaginary part of on-load voltage regulation winding k endpoint node j; for the upper voltage limit after compression; v _cifor the lower voltage limit after compression; s _ifor the slack that node i is introduced, represent the out-of-limit amount of node voltage; W represents in target function the penalty coefficient that voltage out-of-limit is punished; U _irepresent node i voltage magnitude square; v _irepresent the voltage magnitude lower limit of node i; represent the voltage magnitude upper limit of node i; e _irepresent the voltage phasor real part of node i; f _irepresent the voltage phasor imaginary part of node i; P _girepresent that the power supply of node i is meritorious to inject; Q _girepresent the idle injection of power supply of node i; P _lirepresent the burden with power of node i; Q _lirepresent the load or burden without work of node i; B _ifor the shunt susceptance of shunt compensation equipment i; T _kfor the mark no-load voltage ratio of transformer on-load voltage regulating tap k; S _nfor the set of all topology points; S _gby the set of organic end topology point; S _cfor the set of shunt compensation equipment; S _tfor the set of transformer on-load voltage regulating tap.

In one embodiment, also comprise: voltage correction module, for being corrected by the reactive voltage of following formula to each wind energy turbine set:

$\begin{array}{c}\min f({\mathrm{\&Delta;Q}}_G,\mathrm{\&Delta;}V,S)\\ s.t.\left\{\begin{array}{c}{\mathrm{\&Delta;Q}}_G=B\mathrm{\&Delta;}V\\ \begin{array}{cc}\mathrm{\&Delta;}{\underset{\&OverBar;}{Q}}_{Gi}<{\mathrm{\&Delta;Q}}_{Gi}<\mathrm{\&Delta;}{\stackrel{\&OverBar;}{Q}}_{Gi}& i\&Element;S_G\end{array}\\ \begin{array}{cc}\mathrm{\&Delta;}{\underset{\&OverBar;}{V}}_i^c-S<{\mathrm{\&Delta;V}}_i<\mathrm{\&Delta;}{\stackrel{\&OverBar;}{V}}_i^c+S& i\&Element;S_N\end{array}\\ S\&GreaterEqual;0\end{array}\right.\end{array}$

Wherein, B is the matrix that each element imaginary part of admittance matrix is formed, and has identical openness structure with admittance matrix; Δ Q _gfor the total idle injection variable quantity of topological point source; Target function f (Δ Q _g, Δ V, S) and be taken as positive semidefinite quadratic function; S _nfor the set of all topology points; S _gby the set of organic end topology point; Δ V is change in voltage vector; Δ Q _giit is the idle injection change vector of unit; Δ q _giit is unit idle injection change lower limit vector; it is unit idle injection change upper limit vector; S is slack variable; Δ V _iit is the voltage variety of node i; it is the permission change in voltage lower limit after node i compression; it is the permission change in voltage upper limit after node i compression.

In embodiments of the present invention, respectively modeling is carried out to the wind energy turbine set at self place by the AVC substation of each wind energy turbine set, and analyze the reactive voltage regulating power of wind energy turbine set, avoid the detailed modeling realized in the EMS system of regulation and control center in prior art all wind energy turbine set, the workload of its data maintenance will be extremely huge problem; To be calculated the reactive voltage constant value command of each wind energy turbine set AVC substation according to the reactive voltage regulating power of each wind energy turbine set by the AVC main website at regulation and control center, achieve the whole network reactive Voltage Optimum function of AVC main website, avoid idle unreasonable flowing, improve the economy of operation of power networks; The AVC substation of each wind energy turbine set is according to the reactive voltage of self place wind energy turbine set of respective reactive voltage constant value command adjustment, avoid in prior art and deliver to regulation and control center SCADA system by the measurement information of platform wind turbine generator every in each wind energy turbine set, make the data-handling capacity of SCADA system in the face of the problem of greatly test, achieve and can regulate the idle busbar voltage assisting to adjust wind energy turbine set access point in critical point online as required, improve the qualified level of busbar voltage.

Accompanying drawing explanation

Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, does not form limitation of the invention.In the accompanying drawings:

Fig. 1 is the flow chart of the reactive voltage control method of a kind of wind energy turbine set that the embodiment of the present invention provides;

Fig. 2 is a kind of transformer equivalent circuit diagram that the embodiment of the present invention provides;

Fig. 3 is the one laxization voltage and reactive power optimization model schematic that the embodiment of the present invention provides;

Fig. 4 is the structured flowchart of the reactive power/voltage control device of a kind of wind energy turbine set that the embodiment of the present invention provides.

Embodiment

For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with execution mode and accompanying drawing, the present invention is described in further details.At this, exemplary embodiment of the present invention and illustrating for explaining the present invention, but not as a limitation of the invention.

In embodiments of the present invention, provide a kind of reactive voltage control method of wind energy turbine set, as shown in Figure 1, the method comprises:

Step 101: modeling is carried out to the wind energy turbine set at self place respectively in the AVC substation of each wind energy turbine set, and according to the reactive voltage regulating power of modeling analysis self place wind energy turbine set, will analyze the reactive voltage regulating power obtained and report the AVC main website at regulation and control center;

Step 102: the AVC substation of each wind energy turbine set receives the reactive voltage constant value command being sent to respective wind energy turbine set AVC substation by the AVC main website at regulation and control center respectively, described reactive voltage constant value command is calculated according to the reactive voltage regulating power of each wind energy turbine set by the AVC main website at regulation and control center;

Step 103: the AVC substation of each wind energy turbine set is according to the reactive voltage of self place wind energy turbine set of respective reactive voltage constant value command adjustment.

Flow process is as shown in Figure 1 known, in embodiments of the present invention, respectively modeling is carried out to the wind energy turbine set at self place by the AVC substation of each wind energy turbine set, and analyze the reactive voltage regulating power of wind energy turbine set, avoid the detailed modeling realized in the EMS system of regulation and control center in prior art all wind energy turbine set, the workload of its data maintenance will be extremely huge problem; To be calculated the reactive voltage constant value command of each wind energy turbine set AVC substation according to the reactive voltage regulating power of each wind energy turbine set by the AVC main website at regulation and control center, achieve the whole network reactive Voltage Optimum function of AVC main website, avoid idle unreasonable flowing, improve the economy of operation of power networks; The AVC substation of each wind energy turbine set is according to the reactive voltage of self place wind energy turbine set of respective reactive voltage constant value command adjustment, avoid in prior art and deliver to regulation and control center SCADA system by the measurement information of platform wind turbine generator every in each wind energy turbine set, make the data-handling capacity of SCADA system in the face of the problem of greatly test, achieve and can regulate the idle busbar voltage assisting to adjust wind energy turbine set access point in critical point online as required, improve the qualified level of busbar voltage.

During concrete enforcement, regulation and control center EMS system does not carry out detailed modeling to wind energy turbine set, but before modeling is carried out to the wind energy turbine set at self place respectively in the AVC substation of each wind energy turbine set, be unit by the high-pressure side of each wind energy turbine set step-up transformer equivalence, such as, as shown in Figure 2, for transformer branch, can be regarded as an ordinary branch and be connected in series a desirable no-load voltage ratio.

During concrete enforcement, when electrical network occurs that local reactive voltage regulating power is not enough, should voltage control strategy be provided in the same old way and implement closed-loop control, to make out-of-limit point few as much as possible, out-of-limit amount is little as much as possible, therefore, in the present embodiment, the AVC substation of each wind energy turbine set is according to the reactive voltage of self place wind energy turbine set of respective reactive voltage constant value command adjustment, comprise: the traffic coverage of reactive voltage is divided into place of safety, pre-police region and security area (as shown in Figure 3), respectively different penalty coefficients is arranged to place of safety, pre-police region and security area; The penalty coefficient of adjustment place of safety, in advance police region and security area, the reactive voltage of adjustment wind energy turbine set meets reactive voltage constant value command.

Concrete, according to the voltage limits after compression, voltage violation amount being punished, due to the existence of compression bandwidth, by arranging suitable penalty factor, can effectively avoid unnecessary voltage to keep to the side boundary or out-of-limit operation.Such as, by the reactive voltage of following formula adjustment wind energy turbine set:

$\begin{array}{c}\min Obj\left(e,f,U,B,T,Q_G\right)+w\underset{i\&Element;S_N}{\&Sigma;}{s}_i\\ s.t.\end{array}$

$\left\{\begin{array}{cc}{P}_{Gi}-P_{Li}-\underset{j\&Element;S_N}{\&Sigma;}{P}_{ij}\left(e,f,U,B,T\right)=0& i\&Element;S_N\\ Q_{Gi}-Q_{Li}-\underset{j\&Element;S_N}{\&Sigma;}{Q}_{ij}\left(e,f,U,B,T\right)=0& i\&Element;S_N\\ U_i-e_i^2-f_i^2=0& i\&Element;S_N\\ {\underset{\&OverBar;}{Q}}_{Gi}<Q_{Gi}<{\stackrel{\&OverBar;}{Q}}_{Gi}& i\&Element;S_G\\ {({\underset{\&OverBar;}{V}}_{ci}-s_i)}^2<U_i<{({\stackrel{\&OverBar;}{V}}_{ci}+s_i)}^2& i\&Element;S_N\\ {\underset{\&OverBar;}{B}}_i<B_i<{\stackrel{\&OverBar;}{B}}_i& i\&Element;S_C\\ {\underset{\&OverBar;}{T}}_k<T_k<{\stackrel{\&OverBar;}{T}}_k& k\&Element;S_T\\ e_{ck}{T}_k=e_{jk}& k\&Element;S_T\\ f_{ck}{T}_k=f_{jk}& k\&Element;S_T\end{array}\right.$

Wherein, Obj (e, f, U, B, T, Q _g) represent target function; the active power that node i flows out through adjacent legs; it is the reactive power that node i flows out through adjacent legs; Q _giit is the idle injection of node i unit; q _giit is the idle injection lower limit of node i unit; it is the idle injection upper limit of node i unit; B _iit is node i shunt compensation susceptance; b _iit is node i shunt compensation susceptance lower limit; it is the node i shunt compensation susceptance upper limit; T _kit is the mark no-load voltage ratio of on-load voltage regulation winding k; t _kit is the mark no-load voltage ratio lower limit of on-load voltage regulation winding k; it is the mark no-load voltage ratio upper limit of on-load voltage regulation winding k; e _ckit is the voltage real part of on-load voltage regulation winding k intermediate virtual point; e _jkit is the voltage real part of on-load voltage regulation winding k endpoint node j; f _ckit is the voltage imaginary part of on-load voltage regulation winding k intermediate virtual point; f _jkit is the voltage imaginary part of on-load voltage regulation winding k endpoint node j; for the upper voltage limit after compression; v _cifor the lower voltage limit after compression; s _ifor the slack that node i is introduced, represent the out-of-limit amount of node voltage; W represents in target function the penalty coefficient that voltage out-of-limit is punished; U _irepresent node i voltage magnitude square; v _irepresent the voltage magnitude lower limit of node i; represent the voltage magnitude upper limit of node i; e _irepresent the voltage phasor real part of node i; f _irepresent the voltage phasor imaginary part of node i; P _girepresent that the power supply of node i is meritorious to inject; P _lirepresent the burden with power of node i; Q _lirepresent the load or burden without work of node i; S _nfor the set of all topology points; S _gby the set of organic end topology point; S _cfor the set of shunt compensation equipment; S _tfor the set of transformer on-load voltage regulating tap.

During concrete enforcement, when there is long state estimation or voltage and reactive power optimization calculates abnormal, can be corrected by the reactive voltage of following formula to each wind energy turbine set:

$\min f({\mathrm{\&Delta;Q}}_G,\mathrm{\&Delta;}V,S)$

$s.t.\left\{\begin{array}{c}{\mathrm{\&Delta;Q}}_G=B\mathrm{\&Delta;}V\\ \begin{array}{cc}\mathrm{\&Delta;}{\underset{\&OverBar;}{Q}}_{Gi}<{\mathrm{\&Delta;Q}}_{Gi}<\mathrm{\&Delta;}{\stackrel{\&OverBar;}{Q}}_{Gi}& i\&Element;S_G\end{array}\\ \begin{array}{cc}\mathrm{\&Delta;}{\underset{\&OverBar;}{V}}_i^c-S<{\mathrm{\&Delta;V}}_i<\mathrm{\&Delta;}{\stackrel{\&OverBar;}{V}}_i^c+S& i\&Element;S_N\end{array}\\ S\&GreaterEqual;0\end{array}\right.$

Wherein, B is the matrix that each element imaginary part of admittance matrix is formed, and has identical openness structure with admittance matrix; Δ Q _gfor the total idle injection variable quantity of topological point source; Target function f (Δ Q _g, Δ V, S) and be taken as positive semidefinite quadratic function; S _nfor the set of all topology points; S _gby the set of organic end topology point; Δ V is change in voltage vector; Δ Q _giit is the idle injection change vector of unit; Δ q _giit is unit idle injection change lower limit vector; it is unit idle injection change upper limit vector; S is slack variable; Δ V _iit is the voltage variety of node i; it is the permission change in voltage lower limit after node i compression; it is the permission change in voltage upper limit after node i compression.

Describe the reactive voltage control method of above-mentioned wind energy turbine set below in conjunction with concrete example, the method comprises the following steps:

Step 1: regulation and control center EMS system does not carry out detailed modeling to each wind energy turbine set, but is unit by the high-pressure side of step-up transformer in each wind energy turbine set equivalence.

Step 2: detailed modeling is carried out to the wind energy turbine set at self place in wind energy turbine set AVC substation, by modeling, the reactive voltage regulating power in wind energy turbine set is analyzed, the reactive voltage regulating power of wind energy turbine set is converted as the on high-tension side idle bound of step-up transformer, and reports to regulation and control center AVC main website.Consider wind energy turbine set reactive voltage regulating power some can be realized by continuous regulating measure merely, another part regulating power then needs adjustment discrete adjustment means to realize, and is therefore necessary that the reactive voltage regulating power to reporting carries out classification.In addition, the reactive voltage regulating power reported need consider the various security constraints in wind energy turbine set, to ensure that the reactive voltage regulating power reported can realize.

Step 3: the reactive voltage regulating power that regulation and control center AVC main website reports according to each wind energy turbine set AVC substation, provide the idle of each wind farm grid-connected point or voltage definite value order (i.e. above-mentioned reactive voltage constant value command) by policy calculation, and be issued to each wind energy turbine set AVC substation respectively.

Step 4: each wind energy turbine set AVC substation is according to the various reactive voltage regulating measures in certain principle regulating wind power field, to follow the tracks of the idle or voltage definite value order received, namely the AVC substation of each wind energy turbine set is according to the reactive voltage of self place wind energy turbine set of respective reactive voltage constant value command adjustment.

During concrete enforcement, voltage mode control comprises:

Based on the two-stage voltage mode control of OPF, its optimal control cycle is generally a minute level, far be shorter than the optimization cycle of tertiary voltage control, optimum results can reflect the actual conditions of electrical network preferably, and optimum results is directly issued to relevant plant stand enforcement control, can not offset in execution link, voltage security is good, economy is excellent, is the inexorable trend of power system reactive power voltage control development.Certainly, the two-stage voltage mode control based on OPF is all had higher requirement to the reliability of state estimation and voltage and reactive power optimization algorithm and performance.

AVC main website realizes controlling the centralized optimization of the whole network based on voltage and reactive power optimization, makes the online real-time reactive power optimization based on OPF control to be able to through engineering approaches and realizes.Engineering practice fully shows: the real-time voltage power-less optimized algorithm based on OPF can meet the requirement that AVC system closed loop controls optimized algorithm performance and reliability in real time.

Laxization voltage and reactive power optimization model based on quadratic constraints double optimization:

Voltage and reactive power optimization, using the fail safe of operation of power networks as constraints, to improve the economy of operation of power networks as optimization aim, realizes the complex optimum that the whole network is idle.

Adopt rectangular coordinate, trend equilibrium equation can be described as quadratic equation group.When considering shunt compensator and transformer on-load voltage regulating tap-c hange control, then need to introduce additional variable and trend equilibrium equation could be treated to quadratic equation.

For transformer branch, can be regarded as an ordinary branch and be connected in series a desirable no-load voltage ratio, as shown in Figure 2, introduce the voltage phasor e of intermediate node _ik+ jf _ik, then

e _ckT _k＝e _jk

f _ckT _k＝f _jk

The meritorious of transformer branch two ends and reactive power flow can be described as e thus _ik, f _ik, e _ckand f _ckquadratic function.

For the compensation node i of shunt compensator, compensating reactive power is:

$Q_{ci}=(e_i^2+f_i^2)B_i$

Introduce auxiliary variable i.e. U _ifor node i voltage magnitude square.Then have

Q _ci＝U _iB _i

Through above-mentioned process, under rectangular coordinate, voltage and reactive power optimization problem mathematically can be described as following quadratically constrained quadratic programming problem:

$\begin{array}{c}\min Obj\left(e,f,U,B,T,Q_G\right)\\ s.t.\end{array}$

$\left\{\begin{array}{cc}{P}_{Gi}-P_{Li}-\underset{j\&Element;S_N}{\&Sigma;}{P}_{ij}\left(e,f,U,B,T\right)=0& i\&Element;S_N\\ Q_{Gi}-Q_{Li}-\underset{j\&Element;S_N}{\&Sigma;}{Q}_{ij}\left(e,f,U,B,T\right)=0& i\&Element;S_N\\ U_i-e_i^2-f_i^2=0& i\&Element;S_N\\ {\underset{\&OverBar;}{Q}}_{Gi}<Q_{Gi}<{\stackrel{\&OverBar;}{Q}}_{Gi}& i\&Element;S_G\\ {\underset{\&OverBar;}{V}}_i^2<U_i<{\stackrel{\&OverBar;}{V}}_i^2& i\&Element;S_N\\ {\underset{\&OverBar;}{B}}_i<B_i<{\stackrel{\&OverBar;}{B}}_i& i\&Element;S_C\\ {\underset{\&OverBar;}{T}}_k<T_k<{\stackrel{\&OverBar;}{T}}_k& k\&Element;S_T\\ e_{ck}{T}_k=e_{jk}& k\&Element;S_T\\ f_{ck}{T}_k=f_{jk}& k\&Element;S_T\end{array}\right.---\left(1\right)$

In formula, Obj (e, f, B, T, Q _g) be target function, be generally network loss; U _i, v _i, e _i, f _i, P _gi, Q _gi, P _liand Q _lirepresent respectively the voltage magnitude of node i square, voltage magnitude lower limit, the voltage magnitude upper limit, voltage phasor real part, voltage phasor imaginary part, power supply meritorious inject, power supply is idle injection, burden with power and load or burden without work; B _ifor the shunt susceptance of shunt compensation equipment i; T _kfor the mark no-load voltage ratio of transformer on-load voltage regulating tap k; S _nfor the set of all topology points; S _gby the set of organic end topology point; S _cfor the set of shunt compensation equipment; S _tfor the set of transformer on-load voltage regulating tap.

In the actual motion of electrical network, because load is moment change, correspondingly also will there is corresponding fluctuation in busbar voltage amplitude, if working voltage is near examination border, then may cause voltage out-of-limit because of the normal fluctuation of load, therefore voltage feasible region space should suitably be compressed when carrying out voltage control, to improve rate of qualified voltage.In fact, the voltage order one control device of power plant also needs the regular hour in tracking high voltage bus voltage definite value, and there is certain controlling dead error, also certain deviation can be there is between virtual voltage controlling value and definite value, therefore should allow interval boundary that pre-police region is set at voltage, avoid voltage boundary of keeping to the side to run as far as possible.

In load climbing (or landslide) period, due to growth (decline) speed of load, load side voltage has (rising) trend that declines faster, more easily occur that voltage gets over the situation of lower limit (upper limit), suitably should improve the reduced width of relevant voltage lower limit (upper limit), to ensure the quality of voltage of electrical network, improve rate of qualified voltage.For the load variations period relatively stably, the pace of change of voltage magnitude is comparatively slow, and change amplitude is less, and the decrement of voltage limits can suitably reduce, and increases feasible zone space, to reduce the active loss of electrical network, improves the economy of operation of power networks.

From power system operation knowledge: in the inequality constraints of formula (1), generator reactive is exerted oneself, the inequality constraints such as the shunt susceptance of shunt compensation equipment and main transformer tap leader no-load voltage ratio is hard constraint, can not be out-of-limit in the actual motion of electrical network, in optimizing process, answer its feasibility of strict guarantee; The bound limit value of voltage is then soft-constraint, may be out-of-limit in the actual motion of electrical network, just does not wish to occur out-of-limit situation.When the local Reactive-power control scarce capacity of electrical network, the situation that some node voltage is out-of-limit may be there is completely, the voltage and reactive power optimization problem that this up-to-date style (1) is formed without solution, will will show as when adopting most optimized algorithm to solve and do not restrain or can not find feasible solution.Obviously, this can not meet the reliability requirement of closed loop real-time control system to algorithm.

In fact, when local Reactive-power control scarce capacity appears in electrical network, should provide voltage control strategy in the same old way and implement closed-loop control, to make out-of-limit point few as much as possible, out-of-limit amount is little as much as possible.

The possible traffic coverage of voltage can be divided into place of safety, pre-police region and security area according to above-mentioned analysis, place of safety is the voltage Operational Zone expected, therefore need not apply any punishment, and pre-police region then should give certain punishment, and security area then gives larger punishment.

Introduce artificial variables s _ito reflect the voltage out-of-limit amount of node i, and by introducing in target function to the punishment of voltage out-of-limit amount to embody the requirement to line voltage quality, then voltage and reactive power optimization problem can be described below (namely for adjusting the formula of the reactive voltage of wind energy turbine set):

$\begin{array}{c}\min Obj\left(e,f,U,B,T,Q_G\right)+w\underset{i\&Element;S_N}{\&Sigma;}{s}_i\\ s.t.\\ \left\{\begin{array}{cc}{P}_{Gi}-P_{Li}-\underset{j\&Element;S_N}{\&Sigma;}{P}_{ij}\left(e,f,U,B,T\right)=0& i\&Element;S_N\\ Q_{Gi}-Q_{Li}-\underset{j\&Element;S_N}{\&Sigma;}{Q}_{ij}\left(e,f,U,B,T\right)=0& i\&Element;S_N\\ U_i-e_i^2-f_i^2=0& i\&Element;S_N\\ {\underset{\&OverBar;}{Q}}_{Gi}<Q_{Gi}<{\stackrel{\&OverBar;}{Q}}_{Gi}& i\&Element;S_G\\ {({\underset{\&OverBar;}{V}}_{ci}-s_i)}^2<U_i<{({\stackrel{\&OverBar;}{V}}_{ci}+s_i)}^2& i\&Element;S_N\\ {\underset{\&OverBar;}{B}}_i<B_i<{\stackrel{\&OverBar;}{B}}_i& i\&Element;S_C\\ {\underset{\&OverBar;}{T}}_k<T_k<{\stackrel{\&OverBar;}{T}}_k& k\&Element;S_T\\ e_{ck}{T}_k=e_{jk}& k\&Element;S_T\\ f_{ck}{T}_k=f_{jk}& k\&Element;S_T\end{array}\right.\end{array}---\left(2\right)$

Wherein, Obj (e, f, U, B, T, Q _g) represent target function; the active power that node i flows out through adjacent legs; it is the reactive power that node i flows out through adjacent legs; Q _giit is the idle injection of node i unit; q _giit is the idle injection lower limit of node i unit; it is the idle injection upper limit of node i unit; B _iit is node i shunt compensation susceptance; b _iit is node i shunt compensation susceptance lower limit; it is the node i shunt compensation susceptance upper limit; T _kit is the mark no-load voltage ratio of on-load voltage regulation winding k; t _kit is the mark no-load voltage ratio lower limit of on-load voltage regulation winding k; it is the mark no-load voltage ratio upper limit of on-load voltage regulation winding k; e _ckit is the voltage real part of on-load voltage regulation winding k intermediate virtual point; e _jkit is the voltage real part of on-load voltage regulation winding k endpoint node j; f _ckit is the voltage imaginary part of on-load voltage regulation winding k intermediate virtual point; f _jkit is the voltage imaginary part of on-load voltage regulation winding k endpoint node j; for the upper voltage limit after compression; v _cifor the lower voltage limit after compression; s _ifor the slack that node i is introduced, represent the out-of-limit amount of node voltage; W represents in target function the penalty coefficient that voltage out-of-limit is punished; U _irepresent node i voltage magnitude square; v _irepresent the voltage magnitude lower limit of node i; represent the voltage magnitude upper limit of node i; e _irepresent the voltage phasor real part of node i; f _irepresent the voltage phasor imaginary part of node i; P _girepresent that the power supply of node i is meritorious to inject; P _lirepresent the burden with power of node i; Q _lirepresent the load or burden without work of node i; S _nfor the set of all topology points; S _gby the set of organic end topology point; S _cfor the set of shunt compensation equipment; S _tfor the set of transformer on-load voltage regulating tap.

Above-mentioned process be in fact according to compression after voltage limits voltage violation amount is punished, due to the existence of compression bandwidth, by arranging suitable penalty factor, can effectively avoid unnecessary voltage to keep to the side boundary or out-of-limit operation.For one-dimensional case, the traffic coverage of reactive voltage as shown in Figure 3, is divided into place of safety, pre-police region and security area by the laxization voltage and reactive power optimization model constructed.

For the actual motion state of electric power system, when there being the state estimation result of convergence, trend equilibrium equation, unit are idle units limits, the constraint of compensation equipment shunt susceptance bound and main transformer no-load voltage ratio constraint etc. all can be met.When Reactive-power control scarce capacity, as long as slack variable S value is enough large, the bound constraint of voltage also can be met, namely the equation of formula (2) and inequality constraints all will be met, this just means that the optimization problem be made up of formula (2) exists feasible solution certainly, can meet voltage control needs during Reactive-power control ability relative deficiency.

Overall situation voltage corrective control model:

The convergence reliability adopting prim al-dual interior point m ethod to solve laxization voltage and reactive power optimization problem will be very high, and the overall availability factor of state estimation and idle work optimization is higher.Even so, the possibility that state estimation does not restrain still exists, and it is also exist that voltage and reactive power optimization calculates on the possibility theory of not restraining.

By keeping suitable distance with the qualified border of voltage, even if more than ten minute does not carry out Voltage Cortrol, much impacts generally be there is no on the safe operation of electrical network, all the more so in the load variations relatively stable period.For the short time state estimation occurred in operation of power networks or voltage and reactive power optimization unavailable, only need maintain former control strategy, and long state estimation or the disabled possibility of idle work optimization are in fact very little.

When there is long state estimation or voltage and reactive power optimization calculates abnormal, a kind of way is that AVC main website does not go out strategy, local control model is all return by each power plant, maintain original value and carry out voltage control, when occurring voltage out-of-limit or rule of thumb carrying out var-volt regulation close to time out-of-limit by dispatcher.Another kind of possible way is then realize voltage corrective control based on SCADA measurement and sensitivity information.If the voltage of all buses does not all have out-of-limit, and and between border, maintain certain distance, then the former strategy of AVC system held runs, otherwise startup Corrective control runs by middle relatively to make each busbar voltage.Overall voltage corrective control model based on SCADA measurement and sensitivity information can be described below (namely for carrying out updating formula to the reactive voltage of each wind energy turbine set):

$\begin{array}{c}\min f({\mathrm{\&Delta;Q}}_G,\mathrm{\&Delta;}V,S)\\ s.t.\left\{\begin{array}{c}{\mathrm{\&Delta;Q}}_G=B\mathrm{\&Delta;}V\\ \begin{array}{cc}\mathrm{\&Delta;}{\underset{\&OverBar;}{Q}}_{Gi}<{\mathrm{\&Delta;Q}}_{Gi}<\mathrm{\&Delta;}{\stackrel{\&OverBar;}{Q}}_{Gi}& i\&Element;S_G\end{array}\\ \begin{array}{cc}\mathrm{\&Delta;}{\underset{\&OverBar;}{V}}_i^c-S<{\mathrm{\&Delta;V}}_i<\mathrm{\&Delta;}{\stackrel{\&OverBar;}{V}}_i^c+S& i\&Element;S_N\end{array}\\ S\&GreaterEqual;0\end{array}\right.\end{array}---\left(3\right)$

Wherein, B is the matrix that each element imaginary part of admittance matrix is formed, and has identical openness structure with admittance matrix; Δ Q _gfor the total idle injection variable quantity of topological point source; Target function f (Δ Q _g, Δ V, S) and be taken as positive semidefinite quadratic function; S _nfor the set of all topology points; S _gby the set of organic end topology point; Δ V is change in voltage vector; Δ Q _giit is the idle injection change vector of unit; Δ q _giit is unit idle injection change lower limit vector; it is unit idle injection change upper limit vector; S is slack variable; Δ V _iit is the voltage variety of node i; it is the permission change in voltage lower limit after node i compression; it is the permission change in voltage upper limit after node i compression.

This model is sparse convex quadratic programming model, and prim al-dual interior point m ethod can be adopted to solve, and its convergence can obtain effective guarantee in theory.

For AVC system, for the consideration controlling stationarity, in each control cycle, all have certain restriction (being generally less than 0.01PU) to the amplitude of accommodation of busbar voltage, therefore in formula (3), the error of equation constraint equation is less, can meet the required precision in engineering.

When adopting overall voltage corrective control model to implement voltage control, the voltage security of electrical network still can better be ensured, but economy may be poor, as the standby control method of state estimation or voltage and reactive power optimization exception, the overall reliability of AVC system greatly can be improved.

Certainly, when state estimation or voltage and reactive power optimization exception, should reason be searched as early as possible and solve.

The automatic voltage control system optimized based on Global is fully under way at China's net, province and district every aspect, achieves good control effects.Dispose and economize ground coordination Intelligence Reactive Power voltage coordination optimizing control system.Successfully achieve the real-time optimal control to power plant and transformer station, have accumulated abundant operating experience.

Reactive voltage regulating measure in wind energy turbine set is included in AVC to control, contribute to the reactive voltage ability of regulation and control strengthening electrical network, improve fail safe and the economy of operation of power networks.Once after wind energy turbine set access AVC system coordination control, system monitoring personnel can accomplish " real time monitoring controls automatically " the reactive voltage situation in wind energy turbine set.Add the understanding to the operation information in wind energy turbine set on the one hand, also increase the intervention to Reactive Power Device in wind energy turbine set and control device on the other hand newly.

Based on same inventive concept, additionally provide a kind of reactive power/voltage control device of wind energy turbine set in the embodiment of the present invention, as described in the following examples.The principle of dealing with problems due to the reactive power/voltage control device of wind energy turbine set is similar to the reactive voltage control method of wind energy turbine set, therefore the enforcement of the reactive power/voltage control device of wind energy turbine set see the enforcement of the reactive voltage control method of wind energy turbine set, can repeat part and repeats no more.Following used, term " unit " or " module " can realize the software of predetermined function and/or the combination of hardware.Although the device described by following examples preferably realizes with software, hardware, or the realization of the combination of software and hardware also may and conceived.

Fig. 4 is a kind of structured flowchart of the reactive power/voltage control device of the wind energy turbine set of the embodiment of the present invention, as shown in Figure 4, comprising: modeling analysis module 401, receiver module 402 and voltage control module 403, be described this structure below.

Modeling analysis module 401, for carrying out modeling to the wind energy turbine set at self place, AVC substation, and according to the reactive voltage regulating power of modeling analysis self place wind energy turbine set, will analyze the reactive voltage regulating power obtained and report the AVC main website at regulation and control center;

Receiver module 402, be connected with modeling analysis module 401, for receiving the reactive voltage constant value command being sent to respective wind energy turbine set AVC substation by the AVC main website at regulation and control center, described reactive voltage constant value command is calculated according to the reactive voltage regulating power of each wind energy turbine set by the AVC main website at regulation and control center;

Voltage control module 403, is connected with receiver module 402, for each wind energy turbine set AVC substation according to respective reactive voltage constant value command adjustment self place wind energy turbine set reactive voltage.

In one embodiment, before modeling is carried out to the wind energy turbine set at self place respectively in the AVC substation of each wind energy turbine set, in each wind energy turbine set, the high-pressure side of step-up transformer is unit by the EMS equivalence regulating and controlling center.

In one embodiment, described voltage control module, comprising: division unit, for the traffic coverage of reactive voltage being divided into place of safety, pre-police region and security area, arranges different penalty coefficients respectively to place of safety, pre-police region and security area; Control unit, for adjusting the penalty coefficient of place of safety, in advance police region and security area, the reactive voltage of adjustment wind energy turbine set meets reactive voltage constant value command.

In one embodiment, described control unit, the reactive voltage especially by following formula adjustment wind energy turbine set:

$\begin{array}{c}\min Obj\left(e,f,U,B,T,Q_G\right)+w\underset{i\&Element;S_N}{\&Sigma;}{s}_i\\ s.t.\\ \left\{\begin{array}{cc}{P}_{Gi}-P_{Li}-\underset{j\&Element;S_N}{\&Sigma;}{P}_{ij}\left(e,f,U,B,T\right)=0& i\&Element;S_N\\ Q_{Gi}-Q_{Li}-\underset{j\&Element;S_N}{\&Sigma;}{Q}_{ij}\left(e,f,U,B,T\right)=0& i\&Element;S_N\\ U_i-e_i^2-f_i^2=0& i\&Element;S_N\\ {\underset{\&OverBar;}{Q}}_{Gi}<Q_{Gi}<{\stackrel{\&OverBar;}{Q}}_{Gi}& i\&Element;S_G\\ {({\underset{\&OverBar;}{V}}_{ci}-s_i)}^2<U_i<{({\stackrel{\&OverBar;}{V}}_{ci}+s_i)}^2& i\&Element;S_N\\ {\underset{\&OverBar;}{B}}_i<B_i<{\stackrel{\&OverBar;}{B}}_i& i\&Element;S_C\\ {\underset{\&OverBar;}{T}}_k<T_k<{\stackrel{\&OverBar;}{T}}_k& k\&Element;S_T\\ e_{ck}{T}_k=e_{jk}& k\&Element;S_T\\ f_{ck}{T}_k=f_{jk}& k\&Element;S_T\end{array}\right.\end{array}$

Wherein, Obj (e, f, U, B, T, Q _g) represent target function; the active power that node i flows out through adjacent legs; it is the reactive power that node i flows out through adjacent legs; Q _giit is the idle injection of node i unit; q _giit is the idle injection lower limit of node i unit; it is the idle injection upper limit of node i unit; B _iit is node i shunt compensation susceptance; b _iit is node i shunt compensation susceptance lower limit; B _ibe; it is the node i shunt compensation susceptance upper limit; T _kit is the mark no-load voltage ratio of on-load voltage regulation winding k; t _kbeing the mark no-load voltage ratio lower limit of on-load voltage regulation winding k is; it is the mark no-load voltage ratio upper limit of on-load voltage regulation winding k; e _ckit is the voltage real part of on-load voltage regulation winding k intermediate virtual point; e _jkit is the voltage real part of on-load voltage regulation winding k endpoint node j; f _ckit is the voltage imaginary part of on-load voltage regulation winding k intermediate virtual point; f _jkit is the voltage imaginary part of on-load voltage regulation winding k endpoint node j; for the upper voltage limit after compression; v _cifor the lower voltage limit after compression; s _ifor the slack that node i is introduced, represent the out-of-limit amount of node voltage; W represents in target function the penalty coefficient that voltage out-of-limit is punished; U _irepresent node i voltage magnitude square; v _irepresent the voltage magnitude lower limit of node i; represent the voltage magnitude upper limit of node i; e _irepresent the voltage phasor real part of node i; f _irepresent the voltage phasor imaginary part of node i; P _girepresent that the power supply of node i is meritorious to inject; Q _girepresent the idle injection of power supply of node i; P _lirepresent the burden with power of node i; Q _lirepresent the load or burden without work of node i; B _ifor the shunt susceptance of shunt compensation equipment i; T _kfor the mark no-load voltage ratio of transformer on-load voltage regulating tap k; S _nfor the set of all topology points; S _gby the set of organic end topology point; S _cfor the set of shunt compensation equipment; S _tfor the set of transformer on-load voltage regulating tap.

In one embodiment, also comprise: voltage correction module, for being corrected by the reactive voltage of following formula to each wind energy turbine set:

$\begin{array}{c}\min f({\mathrm{\&Delta;Q}}_G,\mathrm{\&Delta;}V,S)\\ s.t.\left\{\begin{array}{c}{\mathrm{\&Delta;Q}}_G=B\mathrm{\&Delta;}V\\ \begin{array}{cc}\mathrm{\&Delta;}{\underset{\&OverBar;}{Q}}_{Gi}<{\mathrm{\&Delta;Q}}_{Gi}<\mathrm{\&Delta;}{\stackrel{\&OverBar;}{Q}}_{Gi}& i\&Element;S_G\end{array}\\ \begin{array}{cc}\mathrm{\&Delta;}{\underset{\&OverBar;}{V}}_i^c-S<{\mathrm{\&Delta;V}}_i<\mathrm{\&Delta;}{\stackrel{\&OverBar;}{V}}_i^c+S& i\&Element;S_N\end{array}\\ S\&GreaterEqual;0\end{array}\right.\end{array}$

Wherein, B is the matrix that each element imaginary part of admittance matrix is formed, and has identical openness structure with admittance matrix; Δ Q _gfor the total idle injection variable quantity of topological point source; Target function f (Δ Q _g, Δ V, S) and be taken as positive semidefinite quadratic function; S _nfor the set of all topology points; S _gby the set of organic end topology point; Δ V is change in voltage vector; Δ Q _giit is the idle injection change vector of unit; Δ q _giit is unit idle injection change lower limit vector; it is unit idle injection change upper limit vector; S is slack variable; Δ V _iit is the voltage variety of node i; it is the permission change in voltage lower limit after node i compression; it is the permission change in voltage upper limit after node i compression.

In embodiments of the present invention, respectively modeling is carried out to the wind energy turbine set at self place by the AVC substation of each wind energy turbine set, and analyze the reactive voltage regulating power of wind energy turbine set, avoid the detailed modeling realized in the EMS system of regulation and control center in prior art all wind energy turbine set, the workload of its data maintenance will be extremely huge problem; To be calculated the reactive voltage constant value command of each wind energy turbine set AVC substation according to the reactive voltage regulating power of each wind energy turbine set by the AVC main website at regulation and control center, achieve the whole network reactive Voltage Optimum function of AVC main website, avoid idle unreasonable flowing, improve the economy of operation of power networks; The AVC substation of each wind energy turbine set is according to the reactive voltage of self place wind energy turbine set of respective reactive voltage constant value command adjustment, avoid in prior art and deliver to regulation and control center SCADA system by the measurement information of platform wind turbine generator every in each wind energy turbine set, make the data-handling capacity of SCADA system in the face of the problem of greatly test, achieve and can regulate the idle busbar voltage assisting to adjust wind energy turbine set access point in critical point online as required, improve the qualified level of busbar voltage.

Obviously, those skilled in the art should be understood that, each module of the above-mentioned embodiment of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the embodiment of the present invention is not restricted to any specific hardware and software combination.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the embodiment of the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a reactive voltage control method for wind energy turbine set, is characterized in that, comprising:

Modeling is carried out to the wind energy turbine set at self place respectively in the auto voltage control AVC substation of each wind energy turbine set, and according to the reactive voltage regulating power of modeling analysis self place wind energy turbine set, will the reactive voltage regulating power obtained be analyzed report the AVC main website at regulation and control center;

The AVC substation of each wind energy turbine set receives the reactive voltage constant value command being sent to respective wind energy turbine set AVC substation by the AVC main website at regulation and control center respectively, and described reactive voltage constant value command is calculated according to the reactive voltage regulating power of each wind energy turbine set by the AVC main website at regulation and control center;

The AVC substation of each wind energy turbine set is according to the reactive voltage of self place wind energy turbine set of respective reactive voltage constant value command adjustment.

2. the reactive voltage control method of wind energy turbine set as claimed in claim 1, is characterized in that, before modeling is carried out to the wind energy turbine set at self place respectively in the AVC substation of each wind energy turbine set, also comprise:

In each wind energy turbine set, the high-pressure side of step-up transformer is unit by the EMS EMS equivalence regulating and controlling center.

3. the reactive voltage control method of wind energy turbine set as claimed in claim 1 or 2, is characterized in that, the AVC substation of each wind energy turbine set, according to the reactive voltage of self place wind energy turbine set of respective reactive voltage constant value command adjustment, comprising:

The traffic coverage of reactive voltage is divided into place of safety, pre-police region and security area, respectively different penalty coefficients is arranged to place of safety, pre-police region and security area;

The penalty coefficient of adjustment place of safety, in advance police region and security area, the reactive voltage of adjustment wind energy turbine set meets reactive voltage constant value command.

4. the reactive voltage control method of wind energy turbine set as claimed in claim 3, is characterized in that, the reactive voltage by following formula adjustment wind energy turbine set:

$\min Obj(e,f,U,B,T,Q_G)+w\underset{i\&Element;S_N}{\&Sigma;}{s}_i$

s.t.

$\left\{\begin{array}{cc}{P}_{Gi}-P_{Li}-\underset{j\&Element;S_N}{\&Sigma;}{P}_{ij}(e,f,U,B,T)=0& i\&Element;S_N\\ Q_{Gi}-Q_{Li}-\underset{j\&Element;S_N}{\&Sigma;}{Q}_{ij}(e,f,U,B,T)=0& i\&Element;S_N\\ U_i-e_i^2-f_i^2=0& i\&Element;S_N\\ {\underset{\&OverBar;}{Q}}_{Gi}<Q_{Gi}<{\stackrel{\&OverBar;}{Q}}_{Gi}& i\&Element;S_G\\ {({\underset{\&OverBar;}{V}}_{ci}-s_i)}^2<U_i<{({\stackrel{\&OverBar;}{V}}_{ci}+s_i)}^2& i\&Element;S_N\\ {\underset{\&OverBar;}{B}}_i<B_i<{\stackrel{\&OverBar;}{B}}_i& i\&Element;S_C\\ {\underset{\&OverBar;}{T}}_k<T_k<{\stackrel{\&OverBar;}{T}}_k& k\&Element;S_T\\ e_{ck}{T}_k=e_{jk}& k\&Element;S_T\\ f_{ck}{T}_k=f_{jk}& k\&Element;S_T\end{array}\right.$

Wherein, Obj (e, f, U, B, T, Q _g) represent target function; the active power that node i flows out through adjacent legs; it is the reactive power that node i flows out through adjacent legs; Q _giit is the idle injection of node i unit; q _giit is the idle injection lower limit of node i unit; it is the idle injection upper limit of node i unit; B _iit is node i shunt compensation susceptance; b _iit is node i shunt compensation susceptance lower limit; it is the node i shunt compensation susceptance upper limit; T _kit is the mark no-load voltage ratio of on-load voltage regulation winding k; t _kit is the mark no-load voltage ratio lower limit of on-load voltage regulation winding k; it is the mark no-load voltage ratio upper limit of on-load voltage regulation winding k; e _ckit is the voltage real part of on-load voltage regulation winding k intermediate virtual point; e _jkit is the voltage real part of on-load voltage regulation winding k endpoint node j; f _ckit is the voltage imaginary part of on-load voltage regulation winding k intermediate virtual point; f _jkit is the voltage imaginary part of on-load voltage regulation winding k endpoint node j; for the upper voltage limit after compression; v _cifor the lower voltage limit after compression; s _ifor the slack that node i is introduced, represent the out-of-limit amount of node voltage; W represents in target function the penalty coefficient that voltage out-of-limit is punished; U _irepresent node i voltage magnitude square; v _irepresent the voltage magnitude lower limit of node i; represent the voltage magnitude upper limit of node i; e _irepresent the voltage phasor real part of node i; f _irepresent the voltage phasor imaginary part of node i; P _girepresent that the power supply of node i is meritorious to inject; P _lirepresent the burden with power of node i; Q _lirepresent the load or burden without work of node i; S _nfor the set of all topology points; S _gby the set of organic end topology point; S _cfor the set of shunt compensation equipment; S _tfor the set of transformer on-load voltage regulating tap.

5. the reactive voltage control method of wind energy turbine set as claimed in claim 1 or 2, be is characterized in that, also comprise: corrected by the reactive voltage of following formula to each wind energy turbine set:

minf(ΔQ _G,ΔV,S)

$s.t.\left\{\begin{array}{cc}{\mathrm{\&Delta;Q}}_G=B\mathrm{\&Delta;}V& \\ \mathrm{\&Delta;}{\underset{\&OverBar;}{Q}}_{Gi}<{\mathrm{\&Delta;Q}}_{Gi}<\mathrm{\&Delta;}{\stackrel{\&OverBar;}{Q}}_{Gi}& i\&Element;S_G\\ \mathrm{\&Delta;}{\underset{\&OverBar;}{V}}_i^c-S<{\mathrm{\&Delta;V}}_i<\mathrm{\&Delta;}{\stackrel{\&OverBar;}{V}}_i^c+S& i\&Element;S_N\\ S\&GreaterEqual;0& \end{array}\right.$

Wherein, B is the matrix that each element imaginary part of admittance matrix is formed, and has identical openness structure with admittance matrix; Δ Q _gfor the total idle injection variable quantity of topological point source; Target function f (Δ Q _g, Δ V, S) and be taken as positive semidefinite quadratic function; S _nfor the set of all topology points; S _gby the set of organic end topology point; Δ V is change in voltage vector; Δ Q _giit is the idle injection change vector of unit; Δ q _giit is unit idle injection change lower limit vector; it is unit idle injection change upper limit vector; S is slack variable; Δ V _iit is the voltage variety of node i; it is the permission change in voltage lower limit after node i compression; it is the permission change in voltage upper limit after node i compression.

6. a reactive power/voltage control device for wind energy turbine set, this application of installation, in AVC substation, is characterized in that, comprising:

Modeling analysis module, for carrying out modeling to the wind energy turbine set at self place, AVC substation, and according to the reactive voltage regulating power of modeling analysis self place wind energy turbine set, will analyze the reactive voltage regulating power obtained and report the AVC main website at regulation and control center;

Receiver module, for receiving the reactive voltage constant value command being sent to respective wind energy turbine set AVC substation by the AVC main website at regulation and control center, described reactive voltage constant value command is calculated according to the reactive voltage regulating power of each wind energy turbine set by the AVC main website at regulation and control center;

Voltage control module, for each wind energy turbine set AVC substation according to respective reactive voltage constant value command adjustment self place wind energy turbine set reactive voltage.

7. the reactive power/voltage control device of wind energy turbine set as claimed in claim 6, it is characterized in that, before modeling is carried out to the wind energy turbine set at self place respectively in the AVC substation of each wind energy turbine set, in each wind energy turbine set, the high-pressure side of step-up transformer is unit by the EMS equivalence regulating and controlling center.

8. the reactive power/voltage control device of wind energy turbine set as claimed in claims 6 or 7, it is characterized in that, described voltage control module, comprising:

Division unit, for the traffic coverage of reactive voltage being divided into place of safety, pre-police region and security area, arranges different penalty coefficients to place of safety, pre-police region and security area respectively;

Control unit, for adjusting the penalty coefficient of place of safety, in advance police region and security area, the reactive voltage of adjustment wind energy turbine set meets reactive voltage constant value command.

9. the reactive power/voltage control device of wind energy turbine set as claimed in claim 8, is characterized in that, described control unit, the reactive voltage especially by following formula adjustment wind energy turbine set:

$\min Obj(e,f,U,B,T,Q_G)+w\underset{i\&Element;S_N}{\&Sigma;}{s}_i$

s.t.

$\left\{\begin{array}{cc}{P}_{Gi}-P_{Li}-\underset{j\&Element;S_N}{\&Sigma;}{P}_{ij}(e,f,U,B,T)=0& i\&Element;S_N\\ Q_{Gi}-Q_{Li}-\underset{j\&Element;S_N}{\&Sigma;}{Q}_{ij}(e,f,U,B,T)=0& i\&Element;S_N\\ U_i-e_i^2-f_i^2=0& i\&Element;S_N\\ {\underset{\&OverBar;}{Q}}_{Gi}<Q_{Gi}<{\stackrel{\&OverBar;}{Q}}_{Gi}& i\&Element;S_G\\ {({\underset{\&OverBar;}{V}}_{ci}-s_i)}^2<U_i<{({\stackrel{\&OverBar;}{V}}_{ci}+s_i)}^2& i\&Element;S_N\\ {\underset{\&OverBar;}{B}}_i<B_i<{\stackrel{\&OverBar;}{B}}_i& i\&Element;S_C\\ {\underset{\&OverBar;}{T}}_k<T_k<{\stackrel{\&OverBar;}{T}}_k& k\&Element;S_T\\ e_{ck}{T}_k=e_{jk}& k\&Element;S_T\\ f_{ck}{T}_k=f_{jk}& k\&Element;S_T\end{array}\right.$

Wherein, Obj (e, f, U, B, T, Q _g) represent target function; the active power that node i flows out through adjacent legs; it is the reactive power that node i flows out through adjacent legs; Q _giit is the idle injection of node i unit; q _giit is the idle injection lower limit of node i unit; it is the idle injection upper limit of node i unit; B _iit is node i shunt compensation susceptance; b _iit is node i shunt compensation susceptance lower limit; B _ibe; it is the node i shunt compensation susceptance upper limit; T _kit is the mark no-load voltage ratio of on-load voltage regulation winding k; t _kbeing the mark no-load voltage ratio lower limit of on-load voltage regulation winding k is; it is the mark no-load voltage ratio upper limit of on-load voltage regulation winding k; e _ckit is the voltage real part of on-load voltage regulation winding k intermediate virtual point; e _jkit is the voltage real part of on-load voltage regulation winding k endpoint node j; f _ckit is the voltage imaginary part of on-load voltage regulation winding k intermediate virtual point; f _jkit is the voltage imaginary part of on-load voltage regulation winding k endpoint node j; for the upper voltage limit after compression; v _cifor the lower voltage limit after compression; s _ifor the slack that node i is introduced, represent the out-of-limit amount of node voltage; W represents in target function the penalty coefficient that voltage out-of-limit is punished; U _irepresent node i voltage magnitude square; v _irepresent the voltage magnitude lower limit of node i; represent the voltage magnitude upper limit of node i; e _irepresent the voltage phasor real part of node i; f _irepresent the voltage phasor imaginary part of node i; P _girepresent that the power supply of node i is meritorious to inject; Q _girepresent the idle injection of power supply of node i; P _lirepresent the burden with power of node i; Q _lirepresent the load or burden without work of node i; B _ifor the shunt susceptance of shunt compensation equipment i; T _kfor the mark no-load voltage ratio of transformer on-load voltage regulating tap k; S _nfor the set of all topology points; S _gby the set of organic end topology point; S _cfor the set of shunt compensation equipment; S _tfor the set of transformer on-load voltage regulating tap.

10. the reactive power/voltage control device of wind energy turbine set as claimed in claims 6 or 7, is characterized in that, also comprise:

Voltage correction module, for being corrected by the reactive voltage of following formula to each wind energy turbine set:

minf(ΔQ _G,ΔV,S)

$s.t.\left\{\begin{array}{cc}{\mathrm{\&Delta;Q}}_G=B\mathrm{\&Delta;}V& \\ \mathrm{\&Delta;}{\underset{\&OverBar;}{Q}}_{Gi}<{\mathrm{\&Delta;Q}}_{Gi}<\mathrm{\&Delta;}{\stackrel{\&OverBar;}{Q}}_{Gi}& i\&Element;S_G\\ \mathrm{\&Delta;}{\underset{\&OverBar;}{V}}_i^c-S<{\mathrm{\&Delta;V}}_i<\mathrm{\&Delta;}{\stackrel{\&OverBar;}{V}}_i^c+S& i\&Element;S_N\\ S\&GreaterEqual;0& \end{array}\right.$

Wherein, B is the matrix that each element imaginary part of admittance matrix is formed, and has identical openness structure with admittance matrix; Δ Q _gfor the total idle injection variable quantity of topological point source; Target function f (Δ Q _g, Δ V, S) and be taken as positive semidefinite quadratic function; S _nfor the set of all topology points; S _gby the set of organic end topology point; Δ V is change in voltage vector; Δ Q _giit is the idle injection change vector of unit; Δ q _giit is unit idle injection change lower limit vector; it is unit idle injection change upper limit vector; S is slack variable; Δ V _iit is the voltage variety of node i; it is the permission change in voltage lower limit after node i compression; it is the permission change in voltage upper limit after node i compression.