CN103560518A - Power system reactive reserve capacity control method - Google Patents

Abstract

The invention relates to a power system reactive reserve capacity control method which comprises the following steps: (1) defining antibodies and antigens, (2) generating a set of antibody group A randomly, (3) carrying out decoding on each antibody in the A and carrying out flow calculation of the corresponding system, and calculating the local affinity and the overall affinity of each antibody to an antigen, (4) sorting each antibody according to the magnitude of the overall affinity, reserving antibodies with large affinity to form a memory antibody group B, carrying out cloning cross variation operation on the antibodies in the B at the same time, reserving antibodies with large overall affinity to form an antibody group C, and arranging B and C according to the magnitude of affinity to form an antibody group D, (5) checking an iteration end condition, and carrying out ending if the condition is satisfied, and (6) generating a set of new antibody group E randomly and forming a new generation of iterative calculation antibody group F by the E and the D together. Compared with the prior art, the method has the advantages of high control accuracy and the reduction of energy consumption.

Description

A kind of power system reactive power reserve capacity control method

Technical field

The present invention relates to a kind of control method of electric power system, especially relate to a kind of power system reactive power reserve capacity control method.

Background technology

Abundant reactive power reserve is to guarantee a stable key factor of system voltage, and therefore, in scheduler routine process, the reactive power reserve of real-time monitoring system is one of important means preventing Voltage Instability.The voltage stability homologous ray dynamic reactive deposit of electric power system is closely related, and voltage collapse is not being met and is associated with reactive requirement in system, and its reason comprises idle production and transmits suffered restriction.In system, the size of generator reactive deposit is that one of voltage stabilization is measured, in the past, the operations staff of system often utilizes the voltage stability of generator reactive deposit situation judgement system, and the idle deposit of crucial generator is the object of the on-Line Voltage Stability Monitoring of many reality.

The reactive power reserve of system does not have clear and definite definition and computing formula so far, mainly because different dynamic reactive power supply point present positions is different, what it sent is idle different to the stable effect of system voltage, so system reactive power reserve capacity is not the simple superposition to these power supply point reactive power reserves.

Summary of the invention

Object of the present invention is exactly to provide in order to overcome the defect of above-mentioned prior art existence the power system reactive power reserve capacity control method that a kind of control precision is high, reduced energy consumption.

Object of the present invention can be achieved through the following technical solutions:

A reserve capacity control method, is characterized in that, comprises the following steps:

(1) definition antibody and antigen, wherein antibody comprises that each generator end node voltage, each adjustable transformer tap_changing gear and each capacitor switching group array become, the multiple objective function of antigen for forming on each antibody;

(2) produce at random one group of antibody population A;

(3) each antibody in A is decoded and the trend of carrying out correspondence system is calculated, by trend, calculates the active loss that can calculate correspondence system after each antibody decoding, and each corresponding node voltage skew with;

Calculate the maximum reactive power of each generator and current reactive power simultaneously, draw each generator reactive reserve capacity, computing system reactive power reserve, thus calculate the whole affinity of each antibody to antigen;

(4) according to whole affinity size, each antibody is sorted, retain the antibody that global affinity is large and form memory antibody group B, the antibody in B is cloned to cross and variation operation simultaneously, the large antibody of whole affinity after reservation operations, forms antibody population C; According to global affinity size, B, C are rearranged to antibody population D;

(5) check iteration termination condition, if reached, finish, otherwise turn next step;

(6) produce at random one group of new antibody population E, jointly form iterative computation antibody population F of new generation with D, go to step (3), restart to calculate.

Described generator end node voltage adopts real coding, and adjustable transformer tap_changing gear and each capacitor switching group number adopt integer coding.

The trend of each described antibody is calculated as follows:

$\left\{\begin{array}{c}\mathrm{\Δ}{P}_i=P_{\mathrm{gi}}-P_{\mathrm{li}}-U_i\underset{j=1}{\overset{N}{\mathrm{\Σ}}}{U}_j(G_{\mathrm{ij}}\cos {\mathrm{\δ}}_{\mathrm{ij}}+B_{\mathrm{ij}}\sin {\mathrm{\δ}}_{\mathrm{ij}})=0\\ \mathrm{\Δ}{Q}_i=Q_{\mathrm{gi}}-Q_{\mathrm{ci}}-Q_{\mathrm{li}}-U_i\underset{j=1}{\overset{N}{\mathrm{\Σ}}}{U}_j(G_{\mathrm{ij}}\sin {\mathrm{\δ}}_{\mathrm{ij}}-B_{\mathrm{ij}}\cos {\mathrm{\δ}}_{\mathrm{ij}})=0\end{array}\right.$

Δ P wherein _igenerated power loss, Δ Q _igenerator reactive loss, P _gi, Q _gimeritorious, the reactive power sent for generator; P _li, Q _limeritorious, reactive power for load; Q _cithe reactive power of sending for reactive-load compensation equipment; U _i, U _jfor node voltage; G _ij, B _ijfor the element in node admittance battle array, δ _ijthe phase difference of node i voltage and node j voltage; I, j are node number; N is node sum.

Compared with prior art, the present invention has the following advantages:

1, utilize reactive-load compensation equipment to carry out voltage control, the voltage magnitude providing based on WAMS and merit angle, reactive-load compensation equipment carrys out regulation voltage amplitude with fuzzy logic control;

2, transformer automatic Regulation is avoided the circulation phenomenon of shunt transformer between transformer station, improves voltage stability;

3, the scheduling of the voltage in power plant, under the state of Voltage Emergency, has the power plant of more idle deposit can improve voltage, thereby reduces the reactive loss of system, and proposes the idle output of container group.

Embodiment

Below in conjunction with specific embodiment, the present invention is described in detail.

A reserve capacity control method, is characterized in that, comprises the following steps:

(1) definition antibody and antigen, wherein antibody comprises that each generator end node voltage, each adjustable transformer tap_changing gear and each capacitor switching group array become, the multiple objective function of antigen for forming on each antibody;

(2) produce at random one group of antibody population A;

(3) each antibody in A is decoded and the trend of carrying out correspondence system is calculated, by trend, calculates the active loss that can calculate correspondence system after each antibody decoding, and each corresponding node voltage skew with;

Calculate the maximum reactive power of each generator and current reactive power simultaneously, draw each generator reactive reserve capacity, computing system reactive power reserve, thus calculate the whole affinity of each antibody to antigen;

(4) according to whole affinity size, each antibody is sorted, retain the antibody that global affinity is large and form memory antibody group B, the antibody in B is cloned to cross and variation operation simultaneously, the large antibody of whole affinity after reservation operations, forms antibody population C; According to global affinity size, B, C are rearranged to antibody population D;

(5) check iteration termination condition, if reached, finish, otherwise turn next step;

(6) produce at random one group of new antibody population E, jointly form iterative computation antibody population F of new generation with D, go to step (3), restart to calculate.

Described generator end node voltage adopts real coding, and adjustable transformer tap_changing gear and each capacitor switching group number adopt integer coding.

The trend of each described antibody is calculated as follows:

$\left\{\begin{array}{c}\mathrm{\Δ}{P}_i=P_{\mathrm{gi}}-P_{\mathrm{li}}-U_i\underset{j=1}{\overset{N}{\mathrm{\Σ}}}{U}_j(G_{\mathrm{ij}}\cos {\mathrm{\δ}}_{\mathrm{ij}}+B_{\mathrm{ij}}\sin {\mathrm{\δ}}_{\mathrm{ij}})=0\\ \mathrm{\Δ}{Q}_i=Q_{\mathrm{gi}}-Q_{\mathrm{ci}}-Q_{\mathrm{li}}-U_i\underset{j=1}{\overset{N}{\mathrm{\Σ}}}{U}_j(G_{\mathrm{ij}}\sin {\mathrm{\δ}}_{\mathrm{ij}}-B_{\mathrm{ij}}\cos {\mathrm{\δ}}_{\mathrm{ij}})=0\end{array}\right.$

Δ P wherein _igenerated power loss, Δ Q _igenerator reactive loss, P _gi, Q _gimeritorious, the reactive power sent for generator; P _li, Q _limeritorious, reactive power for load; Q _cithe reactive power of sending for reactive-load compensation equipment; U _i, U _jfor node voltage; G _ij, B _ijfor the element in node admittance battle array, δ _ijthe phase difference of node i voltage and node j voltage; I, j are node number; N is node sum.

Claims (3)

1. a power system reactive power reserve capacity control method, is characterized in that, comprises the following steps:

(1) definition antibody and antigen, wherein antibody comprises that each generator end node voltage, each adjustable transformer tap_changing gear and each capacitor switching group array become, the multiple objective function of antigen for forming on each antibody;

(2) produce at random one group of antibody population A;

(3) each antibody in A is decoded and the trend of carrying out correspondence system is calculated, by trend, calculates the active loss that can calculate correspondence system after each antibody decoding, and each corresponding node voltage skew with;

Calculate the maximum reactive power of each generator and current reactive power simultaneously, draw each generator reactive reserve capacity, computing system reactive power reserve, thus calculate the whole affinity of each antibody to antigen;

(4) according to whole affinity size, each antibody is sorted, retain the antibody that global affinity is large and form memory antibody group B, the antibody in B is cloned to cross and variation operation simultaneously, the large antibody of whole affinity after reservation operations, forms antibody population C; According to global affinity size, B, C are rearranged to antibody population D;

(5) check iteration termination condition, if reached, finish, otherwise turn next step;

(6) produce at random one group of new antibody population E, jointly form iterative computation antibody population F of new generation with D, go to step (3), restart to calculate.

2. a kind of power system reactive power reserve capacity control method according to claim 1, is characterized in that, described generator end node voltage adopts real coding, and adjustable transformer tap_changing gear and each capacitor switching group number adopt integer coding.

3. a kind of power system reactive power reserve capacity control method according to claim 1, is characterized in that, the trend of each described antibody is calculated as follows:

Δ P wherein _igenerated power loss, Δ Q _igenerator reactive loss, P _gi, Q _gimeritorious, the reactive power sent for generator; P _li, Q _limeritorious, reactive power for load; Q _cithe reactive power of sending for reactive-load compensation equipment; U _i, U _jfor node voltage; G _ij, B _ijfor the element in node admittance battle array, δ _ijthe phase difference of node i voltage and node j voltage; I, j are node number; N is node sum.