CN103166226A - Network voltage reactive-power compound coordination control system and method for new energy power generation - Google Patents

Abstract

The invention belongs to the technical field of voltage reactive-power control of grid-connected operation of new energy power generation with wind power, photovoltaic and the like in electric engineering, and particularly relates to a network voltage reactive-power compound coordination control system and method for new energy power generation. A silent dynamic var generator, a dynamic voltage restorer and an existing transformer station voltage reactive-power comprehensive control device are combined to form a dynamic voltage reactive-power control system, a voltage reactive-power plane is divided into sixteen control areas by the aid of the optimum voltage reactive-power operating state and the unit adjustment variable quantity of a capacitor bank and an on-load voltage regulating transformer tap, and each area corresponds a corresponding control strategy. Network voltage reactive-power frequent fluctuation caused by wind power and photovoltaic intermittent power generation is restrained by coordinately controlling the dynamic voltage reactive-power control system, network voltage reactive-power comprehensive control level is improved, practical engineering application is facilitated, and key technical support is provided for voltage reactive-power comprehensive control of new energy grid-connected power generation in a smart grid.

Description

A kind of line voltage of generation of electricity by new energy is idle composite coordination control system and method

Technical field

The invention belongs to the voltage power-less control technology field of the new energy grid-connected power such as wind-powered electricity generation, photovoltaic operation in electrical engineering, particularly a kind of idle composite coordination control system of line voltage and method that contains generation of electricity by new energy.

Background technology

(the basic performance element of Automatic Voltage Control System-AVC) is transforming plant voltage reactive composite control apparatus (Voltage and Reactive Power Control System-VQC) to the electrical network automatic voltage control system, the VQC device mainly is comprised of capacitor group and on-load tap-changing transformer, and conversion (the On Load Tap Changer-OLTC) to realize line voltage and idle Comprehensive Control of switching and the on-load transformer tap changer of control capacitor groups coordinates in the VQC system by nine district figure control strategies.And in existing VQC device and " nine district figure " control strategy, Main Problems is: the adjusting of on-load transformer tap changer and capacitor group is all to have level to regulate, and regulate differential larger, be difficult to realize accurate control, can produce the phenomenon of oscillation action when adopting in addition nine district figure control strategies in some control area, cause traditional VQC device can not effectively satisfy the voltage power-less fluctuation problem that causes when the batch (-type) generations of electricity by new energy such as wind-powered electricity generation, photovoltaic are incorporated into the power networks.

It is the effective measures that improve grid voltage quality, reduction network loss, improve power network safety operation that the power system reactive power voltage optimization is controlled.Yet large-scale development and user's improving constantly quality of power supply requirement along with generations of electricity by new energy such as wind power generation, photovoltaic generations; take wind-powered electricity generation, photovoltaic as the batch (-type) generation of electricity by new energy of representative has also inevitably caused the power quality problem such as voltage fluctuation, voltage flicker frequently when alleviating Pressure on Energy, had a strong impact on the normal operation of electrical network automatic voltage control system.Therefore, to be suitable for the voltage powerless control system that the batch (-type) generation of electricity by new energy is incorporated into the power networks be very urgent and necessary in research and development.Given this, the present invention has designed dynamic electric voltage powerless control system (Dynamic Voltage and Reactive Power Control System-DVQC), and correspondingly proposed a kind of idle composite coordination control method of line voltage that contains generation of electricity by new energy.Its principle be by based on " 16 district figure " thus the idle composite coordination control method of dynamic electric voltage the various voltage and reactive power compensation devices in DVQC are coordinated to control the outstanding problem that has solved the voltage power-less frequent fluctuation that causes due to batch (-type) new energy grid-connected power operation.The method is controlled for the voltage power-less of new energy grid-connected power operation in intelligent grid the key technology support is provided.

Summary of the invention

The present invention is directed to due to outstanding power quality problems such as frequent voltage fluctuation that the batch (-type) new energy grid-connected power causes, voltage flickers, proposed a kind of idle composite coordination control system of line voltage and method of generation of electricity by new energy.

Composite coordination control system that a kind of line voltage of generation of electricity by new energy is idle, this system is comprised of on-load tap-changing transformer 2, capacitor group 3, silent oscillation dynamic reactive generator 4, dynamic electric voltage recovery device 5, the first power amplification unit 6, the second power amplification unit 7, the 3rd power amplification unit 8, the 4th power amplification unit 9 and voltage power-less composite coordination controller 1; Wherein,

Described voltage power-less composite coordination controller 1 is connected with on-load tap-changing transformer 2 by the first power amplification unit 6;

Described voltage power-less composite coordination controller 1 is connected with capacitor group 3 by the second power amplification unit 7;

Described voltage power-less composite coordination controller 1 is connected with silent oscillation dynamic reactive generator 4 by the 3rd power amplification unit 8;

Described voltage power-less composite coordination controller 1 is connected with dynamic electric voltage recovery device 5 by the 4th power amplification unit 9;

Described on-load tap-changing transformer 2 is connected with dynamic electric voltage recovery device 5;

Be connected with dynamic electric voltage recovery device 5 with on-load tap-changing transformer 2 respectively after described capacitor group 3 and 4 parallel connections of silent oscillation dynamic reactive generator;

Described the first power amplification unit 6, the second power amplification unit 7, the 3rd power amplification unit 8 and the 4th power amplification unit 9 are used for that the weak electric signal that voltage power-less composite coordination controller 1 sends action command is converted to the forceful electric power signal and distribute to each device.

Composite coordination control method that a kind of line voltage of generation of electricity by new energy is idle, the method comprises the following steps:

Step 1: voltage power-less composite coordination controller 1 carries out initialization, receives the information that collects after initialization;

Step 2: voltage power-less composite coordination controller 1 is according to substation low-voltage side busbar voltage U ⁽⁰⁾With the high-pressure side inject reactive power Q ⁽⁰⁾, judge that the voltage power-less running status of current system is in zone of living in 16 district figure subregions;

Step 3: voltage power-less composite coordination controller 1 is according to the voltage power-less running status zone of living in of current system, sends instructions to on-load tap-changing transformer 2, capacitor group 3, silent oscillation dynamic reactive generator 4 and dynamic electric voltage recovery device 5 respectively according to control strategy that should the zone correspondence in the information that collects and 16 district figure control strategies;

Step 4: on-load tap-changing transformer 2, capacitor group 3, silent oscillation dynamic reactive generator 4 and dynamic electric voltage recovery device 5 carry out corresponding actions and realize dynamic voltage power-less composite coordination control after the instruction that the idle composite coordination controller 1 of receiver voltage sends.

Information described in step 1 comprises substation low-voltage side busbar voltage U ⁽⁰⁾The reactive power Q that the high-pressure side is injected ⁽⁰⁾The same day on-load tap-changing transformer 2 tap action frequency N; Can drop into the group of capacitor group and count F _in, can excise the group of capacitor group and count F _outThe current gear k of the tap of on-load tap-changing transformer 2.

Described in step 2, the 16 concrete partitioned modes of district figure are as follows:

One district: provincial characteristics $\left\{\begin{array}{c}Q\≤Q_O-{\mathrm{\ΔQ}}_q\\ U\≥U_O+{\mathrm{\ΔU}}_u\end{array}\right.;$

2nd district: provincial characteristics $\left\{\begin{array}{c}{Q}_O-{\mathrm{\&Delta;Q}}_q<Q\&le;Q_O\\ U\&GreaterEqual;U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.;$

3rd district: provincial characteristics $\left\{\begin{array}{c}{Q}_O<Q<Q_O+{\mathrm{\&Delta;Q}}_q\\ U\&GreaterEqual;U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.;$

4th district: provincial characteristics $\left\{\begin{array}{c}Q\&GreaterEqual;Q_O+{\mathrm{\&Delta;Q}}_q\\ U\&GreaterEqual;U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.;$

5th district: provincial characteristics $\left\{\begin{array}{c}Q\&le;Q_O-{\mathrm{\&Delta;Q}}_q\\ U_O\&le;U<U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.;$

6th district: provincial characteristics $\left\{\begin{array}{c}{Q}_O-{\mathrm{\&Delta;Q}}_q<Q\&le;Q_O\\ U_O\&le;U<U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.;$

7th district: provincial characteristics $\left\{\begin{array}{c}{Q}_O<Q<Q_O+{\mathrm{\&Delta;Q}}_q\\ U_O<U<U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.;$

8th district: provincial characteristics $\left\{\begin{array}{c}{Q}_O+{\mathrm{\&Delta;Q}}_q\&le;Q\\ U_O<U<U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.;$

9th district: provincial characteristics $\left\{\begin{array}{c}{Q}_O-{\mathrm{\&Delta;Q}}_q\&GreaterEqual;Q\\ U_O-{\mathrm{\&Delta;U}}_u<U<U_O\end{array}\right.;$

Tenth district: provincial characteristics $\left\{\begin{array}{c}{Q}_O-{\mathrm{\&Delta;Q}}_q<Q\&le;Q_O\\ U_O-{\mathrm{\&Delta;U}}_u<U<U_O\end{array}\right.;$

Shi Yi district: provincial characteristics $\left\{\begin{array}{c}{Q}_O<Q<Q_O+{\mathrm{\&Delta;Q}}_q\\ U_O-{\mathrm{\&Delta;U}}_u<U\&le;U_O\end{array}\right.;$

No.12 District: provincial characteristics $\left\{\begin{array}{c}Q\&GreaterEqual;Q_O+{\mathrm{\&Delta;Q}}_q\\ U_O-{\mathrm{\&Delta;U}}_u<U\&le;U_O\end{array}\right.;$

Shi San district: provincial characteristics $\left\{\begin{array}{c}Q\&le;Q_O-{\mathrm{\&Delta;Q}}_q\\ U\&le;U_O-{\mathrm{\&Delta;U}}_u\end{array}\right.;$

Shi Si district: provincial characteristics $\left\{\begin{array}{c}{Q}_O-{\mathrm{\&Delta;Q}}_q<Q\&le;Q_O\\ U\&le;U_O-{\mathrm{\&Delta;U}}_u\end{array}\right.;$

Shi Wu district: provincial characteristics $\left\{\begin{array}{c}{Q}_O<Q<Q_O+{\mathrm{\&Delta;Q}}_q\\ U\&le;U_O-{\mathrm{\&Delta;U}}_u\end{array}\right.;$

16th district: provincial characteristics $\left\{\begin{array}{c}Q\&GreaterEqual;Q_O+{\mathrm{\&Delta;Q}}_q\\ U\&le;U_O-{\mathrm{\&Delta;U}}_u\end{array}\right.;$

Wherein, the O point is the optimized operation state of electrical network, U _OBe the voltage of optimized operation state, Q _OBe the reactive power of optimized operation state, Q is the reactive power under the current running status of system, and U is the voltage under the current running status of system, Δ Q _qBe the idle work variable quantity that switching one group capacitor causes, Δ U _uFor the tap of regulating on-load tap-changing transformer 2 changes one grade of voltage variety that causes.

Described in step 2,16 district figure control strategies are:

One district's strategy:

(1) if F _out≠ 0, calculate M.m=|Q ⁽⁰⁾-Q _O|/Δ Q _q(i) if M≤F _out, voltage power-less composite coordination controller 1 sends instruction excision M group capacitor; (ii) if M〉F _out, voltage power-less composite coordination controller 1 sends instruction excision F _outGroup capacitor;

(2) if F _out=0, voltage power-less composite coordination controller 1 sends instruction makes silent oscillation dynamic reactive generator 4 send reactive power compensation amount Q _SVG=Q ⁽⁰⁾-Q _O

Two district's strategies:

(1) if Q _O-Q ⁽⁰⁾Q _ε, entering idle controlling unit, voltage power-less composite coordination controller 1 sends instruction makes silent oscillation dynamic reactive generator 4 send reactive power compensation amount Q _SVG=Q ⁽⁰⁾-Q _O

(2) if Q _O-Q ⁽⁰⁾≤ Q _ε, enter the voltage control link, if (i) k=k _maxAnd N=N _maxIn have an establishment at least, voltage power-less composite coordination controller 1 sends instruction makes dynamic electric voltage recovery device 5 send voltage compensation U _DVR=U _O-U ⁽⁰⁾; (ii) if k＜k _maxAnd N＜N _max, voltage power-less composite coordination controller 1 sends the tap that instruction makes on-load tap-changing transformer 2 and rises one grade;

Three district's strategies:

(1) if k=k _maxAnd N=N _maxIn have an establishment at least, voltage power-less composite coordination controller 1 sends instruction makes dynamic electric voltage recovery device 5 produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

(2) if k＜k _maxAnd N＜N _max, voltage power-less composite coordination controller 1 sends the tap that instruction makes on-load tap-changing transformer 2 and rises one grade;

Four district's strategies:

(1) if k=k _maxAnd N=N _maxIn have an establishment at least, voltage power-less composite coordination controller 1 sends instruction makes dynamic electric voltage recovery device 5 produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

(2) if k＜k _maxAnd N＜N _max, voltage power-less composite coordination controller 1 sends the tap that instruction makes on-load tap-changing transformer 2 and rises one grade;

Five district's strategies:

(1) if F _out≠ 0, M.m=|Q ⁽⁰⁾-Q _O|/Δ Q _qIf, (i) M≤F _out, voltage power-less composite coordination controller 1 sends instruction excision M group capacitor; (ii) if M〉F _out, voltage power-less composite coordination controller 1 sends instruction excision F _outGroup capacitor;

(2) if F _out=0, voltage power-less composite coordination controller 1 sends instruction makes silent oscillation dynamic reactive generator 4 send reactive power compensation amount Q _SVG=Q ⁽⁰⁾-Q _O

Six district's strategies:

(1) if Q _O-Q ⁽⁰⁾Q _ε, entering idle controlling unit, voltage power-less composite coordination controller 1 sends instruction makes silent oscillation dynamic reactive generator 4 send reactive power compensation amount Q _SVG=Q ⁽⁰⁾-Q _O

(2) if Q _O-Q ⁽⁰⁾≤ Q _ε, entering the voltage control link, voltage power-less composite coordination controller 1 sends instruction makes dynamic electric voltage recovery device 5 produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

Seven district's strategies:

Voltage power-less composite coordination controller 1 sends instruction makes dynamic electric voltage recovery device 5 produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

Eight district's strategies:

Voltage power-less composite coordination controller 1 sends instruction makes dynamic electric voltage recovery device 5 produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

Nine district's strategies:

Voltage power-less composite coordination controller 1 sends instruction makes dynamic electric voltage recovery device 5 produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

Ten district's strategies:

Voltage power-less composite coordination controller 1 sends instruction makes dynamic electric voltage recovery device 5 produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

Shi Yi district strategy:

(1) if Q ⁽⁰⁾-Q _OQ _ε, entering idle controlling unit, voltage power-less composite coordination controller 1 sends instruction makes silent oscillation dynamic reactive generator 4 send reactive power compensation amount Q _SVG=Q ⁽⁰⁾-Q _O

(2) if Q ⁽⁰⁾-Q _O≤ Q _ε, enter the voltage control link.Voltage power-less composite coordination controller 1 sends instruction makes dynamic electric voltage recovery device 5 produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

The No.12 District strategy:

(1) if F _in=0, voltage power-less composite coordination controller 1 sends instruction makes silent oscillation dynamic reactive generator 4 send reactive power compensation amount Q _SVG=Q ⁽⁰⁾-Q _O

(2) if F _in≠ 0, calculate M.m=|Q ⁽⁰⁾-Q _O|/Δ Q _q

(i) if M≤F _in, voltage power-less composite coordination controller 1 sends instruction and drops into the M group capacitor;

(ii) if M〉F _in, voltage power-less composite coordination controller 1 sends instruction and drops into F _inGroup capacitor;

Shi San district strategy:

(1) if k=k _minAnd N=N _maxIn have an establishment at least, voltage power-less composite coordination controller 1 sends instruction makes dynamic electric voltage recovery device 5 produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

(2) if k ≠ k _minAnd N ≠ N _max, voltage power-less composite coordination controller 1 sends the tap that instruction makes on-load tap-changing transformer 2 and falls one grade;

Shi Si district strategy:

(1) if k=k _minAnd N=N _maxIn have an establishment at least, voltage power-less composite coordination controller 1 sends instruction makes dynamic electric voltage recovery device 5 produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

(2) if k ≠ k _minAnd N ≠ N _max, voltage power-less composite coordination controller 1 sends the tap that instruction makes on-load tap-changing transformer 2 and falls one grade;

Shi Wu district strategy:

(1) if Q ⁽⁰⁾-Q _OQ _ε, entering idle controlling unit, voltage power-less composite coordination controller 1 sends instruction makes silent oscillation dynamic reactive generator 4 send reactive power compensation amount Q _SVG=Q ⁽⁰⁾-Q _O

(2) if Q ⁽⁰⁾-Q _O≤ Q _ε, enter the voltage control link, if (i) k=k _minAnd N=N _maxIn have an establishment at least, voltage power-less composite coordination controller 1 sends instruction makes dynamic electric voltage recovery device 5 produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾(ii) if k ≠ k _minAnd N ≠ N _max, voltage power-less composite coordination controller 1 sends the tap that instruction makes on-load tap-changing transformer 2 and falls one grade;

16 district's strategies:

(1) if F _in=0, voltage power-less composite coordination controller 1 sends instruction makes silent oscillation dynamic reactive generator 4 send reactive power compensation amount Q _SVG=Q ⁽⁰⁾-Q _O

(2) if F _in≠ 0, calculate M.m=|Q ⁽⁰⁾-Q _O|/Δ Q _q(i) if M≤F _in, voltage power-less composite coordination controller 1 sends instruction and drops into the M group capacitor; (ii) if M〉F _in, voltage power-less composite coordination controller 1 sends instruction and drops into F _inGroup capacitor;

Wherein, total group of number of capacitor group 3 is F _in+ F _outM.m is | Q ⁽⁰⁾-Q _O|/Δ Q _qNumerical value, wherein M representative | Q ⁽⁰⁾-Q _O|/Δ Q _qInteger part, m representative | Q ⁽⁰⁾-Q _O|/Δ Q _qFractional part; The tap upper limit position of on-load tap-changing transformer 2 is k _max, the lower position is k _min

Beneficial effect of the present invention: the present invention adopts the idle composite coordination control system of line voltage and the method for a kind of generation of electricity by new energy that proposes, carry out the voltage power-less dynamic adjustments for the electrical network that contains the batch (-type) generations of electricity by new energy such as wind-powered electricity generation, photovoltaic, can effectively solve the outstanding problem of the voltage power-less frequent fluctuation that randomness, fluctuation, intermittence due to wind-powered electricity generation, photovoltaic cause, can effectively realize the Real-time Balancing of reactive power, guarantee that voltage maintains normal level.Overcome simultaneously the phenomenon of the oscillation action that existing VQC device and nine district figure control strategies may cause, can make the idle dynamic control of line voltage more flexible, be conducive to realize the optimal load flow operation of electrical network, and improved the efficient of generating electricity by way of merging two or more grid systems of the batch (-type) generations of electricity by new energy such as wind-powered electricity generation, photovoltaic.The method can significantly suppress the voltage power-less fluctuation that the batch (-type) generations of electricity by new energy such as wind-powered electricity generation, photovoltaic are incorporated into the power networks and are caused, improved line voltage reactive comprehensive control level, electric network security, stability, reliability and economy when having improved the batch (-type) such as wind-powered electricity generation, photovoltaic new energy grid-connected power operation in the intelligent grid.In a word, the method is particularly suitable for containing the idle coordination control of line voltage of batch (-type) generation of electricity by new energy, is convenient to practical engineering application, and the voltage power-less Comprehensive Control of moving for new energy grid-connected power in intelligent grid provides the key technology support.

Description of drawings

Fig. 1. contain the wind-electricity integration power generation system structure schematic diagram of DVQC in embodiment;

" 16 district figure " control strategy principle schematic in Fig. 2 embodiment;

Dynamic electric voltage powerless control system DVQC operation principle flow chart in Fig. 3 embodiment;

Fig. 4. the wind farm wind velocity change curve in embodiment under the Wind speed up operating mode;

Wind energy turbine set in Fig. 5 embodiment under the Wind speed up operating mode change curve of gaining merit;

The idle change curve contrast of wind energy turbine set before and after DVQC regulates under the Wind speed up operating mode in Fig. 6 embodiment;

Wind energy turbine set change in voltage curve comparison before and after DVQC regulates under the Wind speed up operating mode in Fig. 7 embodiment;

Wind farm wind velocity change curve in Fig. 8 embodiment under actual measurement wind speed operating mode;

The meritorious change curve of wind energy turbine set in Fig. 9 embodiment under actual measurement wind speed operating mode;

The idle change curve contrast of wind energy turbine set before and after DVQC regulates under actual measurement wind speed operating mode in Figure 10 embodiment;

Wind energy turbine set change in voltage curve comparison before and after DVQC regulates under actual measurement wind speed operating mode in Figure 11 embodiment;

Wherein, 1-voltage power-less composite coordination controller, 2-on-load tap-changing transformer, 3-capacitor group, 4-silent oscillation dynamic reactive generator, 5-dynamic electric voltage recovery device, 6-the first power amplification unit, 7-the second power amplification unit, 8-the 3rd power amplification unit, 9-the 4th power amplification unit.

Embodiment

The present invention will be further described below in conjunction with the drawings and specific embodiments.

as shown in Figure 1, existing transforming plant voltage reactive composite control apparatus VQC comprises capacitor group and on-load tap-changing transformer, and the present invention is with silent oscillation dynamic reactive generator (Static Var Generator-SVG), dynamic electric voltage recovery device (Dynamic Voltage Restorer-DVR) combines with existing transforming plant voltage reactive composite control apparatus VQC and has consisted of dynamic electric voltage powerless control system DVQC, wherein, on-load tap-changing transformer 2 is connected with dynamic electric voltage recovery device 5, be connected with dynamic electric voltage recovery device 5 with on-load tap-changing transformer 2 respectively after capacitor group 3 and 4 parallel connections of silent oscillation dynamic reactive generator, the first power amplification unit 6, the second power amplification unit 7, the 3rd power amplification unit 8 and the 4th power amplification unit 9 are used for that the weak electric signal that voltage power-less composite coordination controller 1 sends action command is converted to the forceful electric power signal and distribute to each device.They all are connected to realize reception and the information feedback of ordering by power amplification unit with voltage power-less composite coordination controller 1, command signal is carried out conversion between weak electric signal and forceful electric power signal by power amplification unit.This system utilizes the unit of the idle optimized operation state of line voltage and VQC device (capacitor group, on-load transformer tap changer) to regulate variable quantity, and voltage and idle plane are divided into 16 controlled areas, the corresponding corresponding control strategy of regional.

Fig. 2 has provided " 16 district figure " control strategy principle schematic, control strategy is according to the voltage of system's Real-Time Monitoring, the current running status of idle judgement electrical network region, then control strategy corresponding according to this zone controlled with the cycle in compensating power vacancy and voltage deviation long to discrete type voltage and reactive power control systems such as on-load tap-changing transformer 2 and capacitor groups 3, the mild part of vary within wide limits, control again the dynamic electric voltage reactive-load adjusting devices such as dynamic electric voltage recovery device 5 and silent oscillation dynamic reactive generator 4 short with the cycle in compensating power vacancy and voltage deviation, the dynamic fluctuation part that amplitude is little, thereby realize to real-time and precise the idle control of dynamic electric voltage, improve quality of voltage, reduce network loss, being conducive to Optimum Reactive Power Flow distributes, thereby obtain good technical economic benefit.

In the 16 district figure control strategies of dynamic electric voltage control system DVQC, its desirable control target will be no longer a zone, but a point, the voltage power-less parameter of this operating point is the voltage power-less value under electrical network optimized operation state, calculating link by the electrical network optimal load flow provides.This control program can reach controls target more accurately, realizes the optimization of reactive power flow, guarantees quality of voltage.Wherein, the O point is the optimized operation state of electrical network, U _OBe the voltage of optimized operation state, Q _OBe the reactive power of optimized operation state, Q is the reactive power under the current running status of system, and U is the voltage under the current running status of system, Δ Q _qBe the idle work variable quantity that switching one group capacitor causes, Δ U _uFor the tap of regulating on-load tap-changing transformer changes one grade of voltage variety that causes." 16 district figure " control strategy is take the O point as controlling target, according to Δ U _u, Δ Q _q16 zones have been marked off, Δ U on the voltage power-less plane _u, Δ Q _qValue will be along with the change of the difference of the tap joint position of on-load tap-changing transformer and low-pressure side bus voltage and change.

DVQC System Working Principle flow chart is as shown in 3.In DVQC system judgement operating point interval and before sending corresponding control strategy, at first to obtain following information by electrical network remote signalling, telemetry function at every turn:

(1) substation low-voltage side busbar voltage U ⁽⁰⁾

(2) high-pressure side inject reactive power Q ⁽⁰⁾

(3) to be provided with the tap upper limit position of voltage adjustment of on-load transformer be k to the tap joint position k(of on-load tap-changing transformer _max, the lower position is k _min);

(4) can excise the capacitor group and count F _outAnd can drop into the capacitor group and count F _in

(5) the tap action frequency on the same day of on-load tap-changing transformer is that N(tap maximum actuation every day number of times is restricted to N _max)

Adjusting tap and opening-closing capacitor bank on the mathematical relationship of voltage and idle impact are:

(1) one grade of caused voltage variety of tap-c hange control of on-load tap-changing transformer is suc as formula (1):

ΔU _u=(Δk/k)U' (1)

Wherein, Δ k is the gear change amount between adjacent taps, is fixed value for same transformer; K is the residing gear of tap before regulating; U' is the low-pressure side bus magnitude of voltage before tap-c hange control.

(2) one grade of idle work variable quantity that causes of tap-c hange control of on-load tap-changing transformer is suc as formula (2):

ΔQ _u=(Δk/k)(2+Δk/k)B _CNU' ² (2)

Wherein, B _CNIt is the specified susceptance value of a group capacitor.

(3) voltage variety that causes of switching one group capacitor is suc as formula shown in (3).

ΔU _q=U'*(Q _CN/S _SC) (3)

Wherein, Q _CNIt is the rated capacity of a group capacitor; S _SCMain transformer low-pressure side capacity of short circuit.

(4) idle work variable quantity that causes of switching one group capacitor is suc as formula shown in (4).

ΔQ _q=B _CNU' ² (4)

3, " 16 district figure " control strategy is described in detail as follows:

Here M.m represents a numerical value, the M representative | Q ⁽⁰⁾-Q _O|/Δ Q _qInteger part, m representative | Q ⁽⁰⁾-Q _O|/Δ Q _qFractional part; Q ⁽⁰⁾, U ⁽⁰⁾Initial idle and magnitude of voltage in this control cycle of expression DVQC system, Q ⁽¹⁾, U ⁽¹⁾Idle and magnitude of voltage after expression DVQC system regulates through this control cycle.

⑴ one district: its provincial characteristics $\left\{\begin{array}{c}Q\&le;Q_O-{\mathrm{\&Delta;Q}}_q\\ U\&GreaterEqual;U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.$

At first the section of sentencing capacitor group 3 can the excision group count F _outWhether be 0;

If 1. F _out≠ 0, should preferentially excise capacitor.By | Q _O-Q ⁽⁰⁾|/Δ Q _q=M.m can excise the M group capacitor.Judge that again should excise the capacitor group counts M and can excise the capacitor group and count F _outRelation.

(i) if M≤F _out, can excise the capacitor group and count up to and all can enough satisfy the requirement that should excise capacitor group number, voltage power-less composite coordination controller 1 sends the instruction of excision M group capacitor.The change in voltage that is caused by excision M group capacitor Thereby cause the operation of power networks point from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}=M*{\mathrm{\&Delta;Q}}_q\\ U^{\left(1\right)}=U^{\left(0\right)}+\mathrm{\&Delta;U}\end{array}\right.$

(ii) if M〉F _out, can excise capacitor group number and can not satisfy the requirement that to excise capacitor group number fully.Voltage power-less composite coordination controller 1 can only send excision F _outThe group capacitor instruction.Excision F _outGroup capacitor causes corresponding change in voltage

The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}=F_{\mathrm{out}}*{\mathrm{\&Delta;Q}}_q\\ U^{\left(1\right)}=U^{\left(0\right)}+\mathrm{\&Delta;U}\end{array}\right.$

If 2. F _out=0, can not excise capacitor, should preferentially allow silent oscillation dynamic reactive generator 4 send capacitive reactive power, its value size is Q _SVG=Q ⁽⁰⁾-Q _O, correspondingly can cause voltage variety Δ U=-(U ⁽⁰⁾/ S _SC) * | Q _SVG|.The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q_O\\ U^{\left(1\right)}=U^{\left(0\right)}+\mathrm{\&Delta;U}\end{array}\right.$

⑵ 2nd district: its provincial characteristics $\left\{\begin{array}{c}{Q}_O-{\mathrm{\&Delta;Q}}_q<Q\&le;Q_O\\ U\&GreaterEqual;U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.$

At first judge Q _O-Q ⁽⁰⁾Q _εSet up no.Q _εBe the reactive power adjusting deviation amount that allows in actual operating mode.

1. Q _O-Q ⁽⁰⁾Q _ε, enter idle controlling unit.Idle work variable quantity because idle difference causes less than switching one group capacitor so need not opening-closing capacitor bank 3, directly makes silent oscillation dynamic reactive generator 4 send capacitive reactive power, and its value is Q _SVG=Q ⁽⁰⁾-Q _O, cause that correspondingly voltage variety is Δ U=(U ⁽⁰⁾/ S _SC) * | Q _SVG|, the operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q_O\\ U^{\left(1\right)}=U^{\left(0\right)}+\mathrm{\&Delta;U}\end{array}\right.$

2. Q _O-Q ⁽⁰⁾≤ Q _ε, enter the voltage control link.The step-down that upgrades of tap that need to regulate on-load tap-changing transformer 2 needs judge whether the tap joint position k of on-load tap-changing transformer 2 is in lower limit k this moment _minAnd whether action frequency N reaches the maximum action frequency N that allows _max

(i) if k=k _maxAnd N=N _maxIn have an establishment at least, show that the tap of on-load tap-changing transformer 2 is non-adjustable.Should make this moment dynamic electric voltage recovery device 5 actions produce voltage compensation quantity, its value is U _DVR=U _O-U ⁽⁰⁾, the operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q_O\\ U^{\left(1\right)}=U_O\end{array}\right.$

(ii) if k＜k _maxAnd N＜N _max, the step-down that upgrades of the tap of regulating on-load tap-changing transformer 2.Thereby voltage variety is Δ U _u=-(Δ k/k) U ⁽⁰⁾, the idle work variable quantity that causes owing to upgrading is The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}+\mathrm{\&Delta;Q}\\ U^{\left(1\right)}=U^{\left(0\right)}+{\mathrm{\&Delta;U}}_u\end{array}\right.$

⑶ 3rd district: its provincial characteristics $\left\{\begin{array}{c}{Q}_O<Q<Q_O+{\mathrm{\&Delta;Q}}_q\\ U\&GreaterEqual;U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.$

At first, need to judge whether the tap joint position k of on-load tap-changing transformer 2 is in lower limit k _maxAnd whether action frequency N reaches the maximum action frequency N that allows _max

If 1. k=k _maxAnd N=N _maxIn have an establishment at least, the tap of on-load tap-changing transformer 2 step-down that can not upgrade again.Should allow this moment and directly allow dynamic electric voltage recovery device 5 directly produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾, the operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}\\ U^{\left(1\right)}=U^{\left(0\right)}+U_{\mathrm{DVR}}\end{array}\right.$

If 2. k＜k _maxAnd N＜N _max, can make the step-down that upgrades of the tap of on-load tap-changing transformer 2.

The tap of on-load tap-changing transformer 2 rises one grade and causes that voltage variety is Δ U _u=-(Δ k/k) U ⁽⁰⁾, corresponding idle work variable quantity is

The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}+\mathrm{\&Delta;Q}\\ U^{\left(1\right)}=U^{\left(0\right)}+{\mathrm{\&Delta;U}}_u\end{array}\right.$

⑷ 4th district: its provincial characteristics $\left\{\begin{array}{c}Q\&GreaterEqual;Q_O+{\mathrm{\&Delta;Q}}_q\\ U\&GreaterEqual;U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.$

At first, need to judge whether the tap joint position k of on-load tap-changing transformer 2 is in lower limit k _maxAnd whether action frequency N reaches the maximum action frequency N that allows _max

If 1. k=k _maxAnd N=N _maxIn have an establishment at least, the tap of on-load tap-changing transformer 2 step-down that can not upgrade again.Should directly allow this moment dynamic electric voltage recovery device 5 directly produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾, the operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}\\ U^{\left(1\right)}=U^{\left(0\right)}+U_{\mathrm{DVR}}\end{array}\right.$

If 2. k＜k _maxAnd N＜N _max, make the step-down that upgrades of the tap of on-load tap-changing transformer 2.

The tap of on-load tap-changing transformer 2 rises one grade and causes that voltage variety is Δ U _u=-(Δ k/k) U ⁽⁰⁾, corresponding idle work variable quantity is

The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}+\mathrm{\&Delta;Q}\\ U^{\left(1\right)}=U^{\left(0\right)}+{\mathrm{\&Delta;U}}_u\end{array}\right.$

⑸ 5th district: its provincial characteristics $\left\{\begin{array}{c}Q\&le;Q_O-{\mathrm{\&Delta;Q}}_q\\ U_O\&le;U<U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.$

At first the section of sentencing capacitor group 3 can the excision group count F _outWhether be 0;

If 1. F _out≠ 0, should preferentially excise capacitor.By | Q _O-Q ⁽⁰⁾| Δ Q _q=M.m can excise the M group capacitor.Judge that again should excise the capacitor group counts M and can excise the capacitor group and count F _outRelation.

(i) if M≤F _out, can excise the capacitor group and count up to and all can enough satisfy the requirement that should excise capacitor group number, voltage power-less composite coordination controller 1 sends the instruction of excision M group capacitor.The change in voltage that is caused by excision M group capacitor

Thereby cause the operation of power networks point from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}+M*{\mathrm{\&Delta;Q}}_q\\ U^{\left(1\right)}=U^{\left(0\right)}+\mathrm{\&Delta;U}\end{array}\right.$

(ii) if M〉F _out, can excise capacitor group number and can not satisfy the requirement that to excise capacitor group number fully.Voltage power-less composite coordination controller 1 can only send excision F _outThe group capacitor instruction.Excision F _outGroup capacitor causes corresponding change in voltage

The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}+F_{\mathrm{out}}*{\mathrm{\&Delta;Q}}_q\\ U^{\left(1\right)}=U^{\left(0\right)}+\mathrm{\&Delta;U}\end{array}\right.$

If 2. F _out=0, can not excise capacitor, should preferentially allow silent oscillation dynamic reactive generator 4 send capacitive reactive power, its value size is Q _SVG=Q ⁽⁰⁾-Q _O, correspondingly can cause voltage variety Δ U=-(U ⁽⁰⁾/ S _SC) * | Q _SVG|.The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q_O\\ U^{\left(1\right)}=U^{\left(0\right)}+\mathrm{\&Delta;U}\end{array}\right.$

⑹ 6th district: its provincial characteristics $\left\{\begin{array}{c}{Q}_O-{\mathrm{\&Delta;Q}}_q<Q\&le;Q_O\\ U_O\&le;U<U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.$

At first judge Q _O-Q ⁽⁰⁾Q _εSet up no.

If 1. Q _O-Q ⁽⁰⁾Q _ε, enter idle controlling unit.At first allow silent oscillation dynamic reactive generator 4 send capacitive reactive power, its value is Q _SVG=Q ⁽⁰⁾-Q _O, cause correspondingly voltage variety

The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q_O\\ U^{\left(1\right)}=U^{\left(0\right)}+\mathrm{\&Delta;U}\end{array}\right.$

If 2. Q _O-Q ⁽⁰⁾≤ Q _ε, enter the voltage control link.Directly make dynamic electric voltage recovery device 5 actions, make it produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾, the operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q_O\\ U^{\left(1\right)}=U_O\end{array}\right.$

⑺ 7th district: its provincial characteristics $\left\{\begin{array}{c}{Q}_O<Q<Q_O+{\mathrm{\&Delta;Q}}_q\\ U_O<U<U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.$

Directly make dynamic electric voltage recovery device 5 actions, make it produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾, the operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}\\ U^{\left(1\right)}=U_O\end{array}\right.$

⑻ 8th district: its provincial characteristics $\left\{\begin{array}{c}{Q}_O+{\mathrm{\&Delta;Q}}_q\&le;Q\\ U_O<U<U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.$

Directly make dynamic electric voltage recovery device 5 actions, make it produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾, the operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}\\ U^{\left(1\right)}=U_O\end{array}\right.$

⑼ 9th district: its provincial characteristics $\left\{\begin{array}{c}{Q}_O-{\mathrm{\&Delta;Q}}_q\&GreaterEqual;Q\\ U_O-{\mathrm{\&Delta;U}}_u<U<U_O\end{array}\right.$

Directly make dynamic electric voltage recovery device 5 actions, make it produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾, the operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}\\ U^{\left(1\right)}=U_O\end{array}\right.$

⑽ tenth district: its provincial characteristics $\left\{\begin{array}{c}{Q}_O-{\mathrm{\&Delta;Q}}_q<Q\&le;Q_O\\ U_O-{\mathrm{\&Delta;U}}_u<U<U_O\end{array}\right.$

Directly make dynamic electric voltage recovery device 5 actions, make it produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾, the operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}\\ U^{\left(1\right)}=U_O\end{array}\right.$

⑾ Shi Yi district: its provincial characteristics $\left\{\begin{array}{c}{Q}_O<Q<Q_O+{\mathrm{\&Delta;Q}}_q\\ U_O-{\mathrm{\&Delta;U}}_u<U\&le;U_O\end{array}\right.$

At first judge Q ⁽⁰⁾-Q _OQ _εSet up no.

If 1. Q ⁽⁰⁾-Q _OQ _ε, enter idle controlling unit.Allow silent oscillation dynamic reactive generator 4 send lagging reactive power, its value is Q _SVG=Q ⁽⁰⁾-Q _O, cause that corresponding voltage variety is

The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q_O\\ U^{\left(1\right)}=U^{\left(0\right)}+\mathrm{\&Delta;U}\end{array}\right.$

If 2. Q ⁽⁰⁾-Q _O≤ Q _ε, enter the voltage control link.Make dynamic electric voltage recovery device 5 actions produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾, the operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q_O\\ U^{\left(1\right)}=U_O\end{array}\right.$

⑿ No.12 District: its provincial characteristics $\left\{\begin{array}{c}Q\&GreaterEqual;Q_O+{\mathrm{\&Delta;Q}}_q\\ U_O-{\mathrm{\&Delta;U}}_u<U\&le;U_O\end{array}\right.$

At first judge that capacitor can the input group count F _inWhether be 0.

If 1. F _in=0, illustrate that capacitorless can throw.Need to make silent oscillation dynamic reactive generator 4 send lagging reactive power, its value is Q _SVG=Q ⁽⁰⁾-Q _O, cause corresponding voltage variety The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q_O\\ U^{\left(1\right)}=U^{\left(0\right)}+\mathrm{\&Delta;U}\end{array}\right.$

If 2. F _in≠ 0, can drop into capacitor group 3.By | Q _O-Q ⁽⁰⁾|/Δ Q _q=M.m needs to drop into the M group capacitor as can be known.

(i) if M≤F _in, can drop into the capacitor group and count up to and enough to satisfy the requirement that should drop into capacitor group number.Send the instruction that drops into the M group capacitor, cause corresponding voltage variety

The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}-M*{\mathrm{\&Delta;Q}}_q\\ U^{\left(1\right)}=U^{\left(0\right)}+\mathrm{\&Delta;U}\end{array}\right.$

(ii) if M〉F _in, can only drop into F _inGroup capacitor causes that correspondingly voltage variety is

The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}-F_{\mathrm{in}}*{\mathrm{\&Delta;Q}}_q\\ U^{\left(1\right)}=U^{\left(0\right)}+\mathrm{\&Delta;U}\end{array}\right.$

⒀ Shi San district: its provincial characteristics $\left\{\begin{array}{c}Q\&le;Q_O-{\mathrm{\&Delta;Q}}_q\\ U\&le;U_O-{\mathrm{\&Delta;U}}_u\end{array}\right.$

Whether the tap joint position k that at first judges on-load tap-changing transformer 2 is in lower limit k _minAnd whether action frequency N reaches the maximum action frequency N that allows _max

If 1. k=k _minAnd N=N _maxIn have an establishment at least, the tap of on-load tap-changing transformer 2 action of can't transferring the files again should allow dynamic electric voltage recovery device 5 direct actions produce voltage compensation quantity U this moment _DVR=U _O-U ⁽⁰⁾, the operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}\\ U^{\left(1\right)}=U_O\end{array}\right.$

If 2. k ≠ k _minAnd N ≠ N _max, make the tap of on-load tap-changing transformer 2 lower category and boost, be Δ U thereby cause voltage variety _u=(Δ k/k) U ⁽⁰⁾, cause that corresponding idle work variable quantity is

The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}+{\mathrm{\&Delta;Q}}_q\\ U^{\left(1\right)}=U^{\left(0\right)}+{\mathrm{\&Delta;U}}_u\end{array}\right.$

⒁ Shi Si district: its provincial characteristics $\left\{\begin{array}{c}{Q}_O-{\mathrm{\&Delta;Q}}_q<Q\&le;Q_O\\ U\&le;U_O-{\mathrm{\&Delta;U}}_u\end{array}\right.$

Whether the tap joint position k that at first judges on-load tap-changing transformer 2 is in lower limit k _minAnd whether action frequency N reaches the maximum action frequency N that allows _max

If 1. k=k _minAnd N=N _maxIn have an establishment at least, the tap that on-load tap-changing transformer 2 is described can't lower category again and boost, and should allow this moment dynamic electric voltage recovery device 5 direct actions produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾, the operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}\\ U^{\left(1\right)}=U_O\end{array}\right.$

If 2. k ≠ k _minAnd N ≠ N _max, make the tap of on-load tap-changing transformer 2 lower category and boost, be Δ U thereby cause voltage variety _u=(Δ k/k) U ⁽⁰⁾, cause that corresponding idle work variable quantity is

The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}+{\mathrm{\&Delta;Q}}_q\\ U^{\left(1\right)}=U^{\left(0\right)}+{\mathrm{\&Delta;U}}_u\end{array}\right.$

⒂ Shi Wu district: its provincial characteristics $\left\{\begin{array}{c}{Q}_O<Q<Q_O+{\mathrm{\&Delta;Q}}_q\\ U\&le;U_O-{\mathrm{\&Delta;U}}_u\end{array}\right.$

At first judge Q ⁽⁰⁾-Q _OQ _εSet up no.

If 1. Q ⁽⁰⁾-Q _OQ _ε, enter idle controlling unit.Allow 4 actions of silent oscillation dynamic reactive generator send perception idle, its value is Q _SVG=Q ⁽⁰⁾-Q _O, cause corresponding voltage variety

The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q_O\\ U^{\left(1\right)}=U^{\left(0\right)}+\mathrm{\&Delta;U}\end{array}\right.$

If 2. Q ⁽⁰⁾-Q _O≤ Q _ε, enter the voltage control link.Whether the tap joint position k that at first, judges on-load tap-changing transformer 2 is in lower limit k _minAnd whether action frequency N reaches the maximum action frequency N that allows _max

(i) if k=k _minAnd N=N _maxIn have an establishment at least, the tap that on-load tap-changing transformer 2 is described can't lower category again and boost, and should allow this moment dynamic electric voltage recovery device 5 direct actions produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾, the operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q_O\\ U^{\left(1\right)}=U_O\end{array}\right.$

If (ii) k ≠ k _minAnd N ≠ N _max, make the tap of on-load tap-changing transformer 2 lower category and boost, be Δ U thereby cause voltage variety _u=(Δ k/k) U ⁽⁰⁾, cause that corresponding idle work variable quantity is

The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}+{\mathrm{\&Delta;Q}}_q\\ U^{\left(1\right)}=U^{\left(0\right)}+{\mathrm{\&Delta;U}}_u\end{array}\right.$

⒃ 16th district: its provincial characteristics $\left\{\begin{array}{c}Q\&GreaterEqual;Q_O+{\mathrm{\&Delta;Q}}_q\\ U\&le;U_O-{\mathrm{\&Delta;U}}_u\end{array}\right.$

At first judge that capacitor can the input group count F _inWhether be 0.

If 1. F _in=0, illustrate that capacitorless can throw.Need to make silent oscillation dynamic reactive generator 4 send lagging reactive power, its value is Q _SVG=Q ⁽⁰⁾-Q _O, cause corresponding voltage variety The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q_O\\ U^{\left(1\right)}=U^{\left(0\right)}+\mathrm{\&Delta;U}\end{array}\right.$

If 2. F _in≠ 0, can drop into capacitor group 3.By | Q _O-Q ⁽⁰⁾|/Δ Q _q=M.m needs to drop into the M group capacitor as can be known.

(i) if M≤F _in, can drop into the capacitor group and count up to and enough to satisfy the requirement that should drop into capacitor group number.Send the instruction that drops into the M group capacitor, cause corresponding voltage variety

The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}-M*{\mathrm{\&Delta;Q}}_q\\ U^{\left(1\right)}=U^{\left(0\right)}+\mathrm{\&Delta;U}\end{array}\right.$

(ii) if M〉F _in, can only drop into F _inGroup capacitor causes that correspondingly voltage variety is

The operation of power networks state will be from (Q ⁽⁰⁾, U ⁽⁰⁾) become (Q ⁽¹⁾, U ⁽¹⁾), wherein $\left\{\begin{array}{c}{Q}^{\left(1\right)}=Q^{\left(0\right)}-F_{\mathrm{in}}*{\mathrm{\&Delta;Q}}_q\\ U^{\left(1\right)}=U^{\left(0\right)}+\mathrm{\&Delta;U}\end{array}\right.$

Built the emulation experiment model of the wind-electricity integration electricity generation system that contains DVQC as shown in Figure 1 under the MATLAB/SIMULINK simulated environment.This simulation model capacity of having simulated is that the wind energy turbine set of 50MW is through the 110/35kV on-load tap-changing transformer access electrical network that boosts, the wind energy turbine set unit is collected to wind energy turbine set 110kV booster stations with 35kV voltage, go out on the 110kV bus that a 110kV circuit (LGJ-240) accesses certain 220kV transformer station, line length is about 18km.Wherein, main transformer is selected the two volume step-up transformers of an air-cooled copper winding of three-phase oil immersion on-load voltage regulation, and its model specification is: SFPZ-50000/110121 ± 8*1.25%/35kV; This wind energy turbine set primary substation low-pressure side bus parallel connection 8 pool-sizes be the capacitor of 2000kVar; Silent oscillation dynamic reactive generator SVG capacity is 10Mvar.This analogue system has been carried out emulation experiment under the actual measurement wind speed operating mode of the Wind speed up operating mode of simulating and domestic certain wind energy turbine set.Simulation result is as shown in Fig. 4～11, wherein Fig. 4～7 are the wind speed of wind-powered electricity generation grid-connected system under the Wind speed up operating mode, meritorious, the idle and change in voltage correlation curve before and after DVQC regulates, and Fig. 8～11 are the wind speed of wind-powered electricity generation grid-connected system under actual measurement wind speed operating mode, meritorious, the idle and change in voltage correlation curve before and after DVQC regulates.

By Fig. 4～11 as seen, can find out by the adjusting based on the dynamic electric voltage powerless control system DVQC of the idle composite coordination control method of dynamic electric voltage of " 16 district figure " at Wind speed up operating mode and a kind of simulation result of surveying under the wind speed operating mode by wind-electricity integration electricity generation system simulation model, the voltage power-less fluctuation that wind speed drastic change and fluctuations in wind speed cause has obtained effectively suppressing, improved significantly the voltage power-less running status of electrical network, compensation effect is more accurate, has greatly improved security and stability and the economy of operation of power networks.

Claims (5)

1. the idle composite coordination control system of the line voltage of a generation of electricity by new energy, it is characterized in that, this system is comprised of on-load tap-changing transformer (2), capacitor group (3), silent oscillation dynamic reactive generator (4), dynamic electric voltage recovery device (5), the first power amplification unit (6), the second power amplification unit (7), the 3rd power amplification unit (8), the 4th power amplification unit (9) and voltage power-less composite coordination controller (1); Wherein,

Described voltage power-less composite coordination controller (1) is connected with on-load tap-changing transformer (2) by the first power amplification unit (6);

Described voltage power-less composite coordination controller (1) is connected with capacitor group (3) by the second power amplification unit (7);

Described voltage power-less composite coordination controller (1) is connected with silent oscillation dynamic reactive generator (4) by the 3rd power amplification unit (8);

Described voltage power-less composite coordination controller (1) is connected with dynamic electric voltage recovery device (5) by the 4th power amplification unit (9);

Described on-load tap-changing transformer (2) is connected with dynamic electric voltage recovery device (5);

Be connected with dynamic electric voltage recovery device (5) with on-load tap-changing transformer (2) respectively after described capacitor group (3) and silent oscillation dynamic reactive generator (4) parallel connection;

Described the first power amplification unit (6), the second power amplification unit (7), the 3rd power amplification unit (8) and the 4th power amplification unit (9) are used for that the weak electric signal that voltage power-less composite coordination controller (1) sends action command is converted to the forceful electric power signal and distribute to each device.

2. the idle composite coordination control method of the line voltage of a generation of electricity by new energy, is characterized in that, the method comprises the following steps:

Step 1: voltage power-less composite coordination controller (1) carries out initialization, receives the information that collects after initialization;

Step 2: voltage power-less composite coordination controller (1) is according to substation low-voltage side busbar voltage U ⁽⁰⁾With the high-pressure side inject reactive power Q ⁽⁰⁾, judge that the voltage power-less running status of current system is in zone of living in 16 district figure subregions;

Step 3: voltage power-less composite coordination controller (1) is according to the voltage power-less running status zone of living in of current system, sends instruction to on-load tap-changing transformer (2), capacitor group (3), silent oscillation dynamic reactive generator (4) and dynamic electric voltage recovery device (5) respectively according to control strategy that should the zone correspondence in the information that collects and 16 district figure control strategies;

Step 4: on-load tap-changing transformer (2), capacitor group (3), silent oscillation dynamic reactive generator (4) and dynamic electric voltage recovery device (5) carry out corresponding actions and realize dynamic voltage power-less composite coordination control after the instruction that the idle composite coordination controller of receiver voltage (1) sends.

3. the idle composite coordination control method of a kind of line voltage of generation of electricity by new energy according to claim 2, is characterized in that, information described in step 1 comprises substation low-voltage side busbar voltage U ⁽⁰⁾The reactive power Q that the high-pressure side is injected ⁽⁰⁾The tap action frequency N of on-load tap-changing transformer on the same day (2); Can drop into the group of capacitor group and count F _in, can excise the group of capacitor group and count F _outThe current gear k of the tap of on-load tap-changing transformer (2).

4. the idle composite coordination control method of the line voltage of a kind of generation of electricity by new energy according to claim 3, is characterized in that, described in step 2, the 16 concrete partitioned modes of district figure are as follows:

One district: provincial characteristics $\left\{\begin{array}{c}Q\&le;Q_O-{\mathrm{\&Delta;Q}}_q\\ U\&GreaterEqual;U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.;$

2nd district: provincial characteristics $\left\{\begin{array}{c}{Q}_O-{\mathrm{\&Delta;Q}}_q<Q\&le;Q_O\\ U\&GreaterEqual;U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.;$

3rd district: provincial characteristics $\left\{\begin{array}{c}{Q}_O<Q<Q_O+{\mathrm{\&Delta;Q}}_q\\ U\&GreaterEqual;U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.;$

4th district: provincial characteristics $\left\{\begin{array}{c}Q\&GreaterEqual;Q_O+{\mathrm{\&Delta;Q}}_q\\ U\&GreaterEqual;U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.;$

5th district: provincial characteristics $\left\{\begin{array}{c}Q\&le;Q_O-{\mathrm{\&Delta;Q}}_q\\ U_O\&le;U<U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.;$

6th district: provincial characteristics $\left\{\begin{array}{c}{Q}_O-{\mathrm{\&Delta;Q}}_q<Q\&le;Q_O\\ U_O\&le;U<U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.;$

7th district: provincial characteristics $\left\{\begin{array}{c}{Q}_O<Q<Q_O+{\mathrm{\&Delta;Q}}_q\\ U_O<U<U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.;$

8th district: provincial characteristics $\left\{\begin{array}{c}{Q}_O+{\mathrm{\&Delta;Q}}_q\&le;Q\\ U_O<U<U_O+{\mathrm{\&Delta;U}}_u\end{array}\right.;$

9th district: provincial characteristics $\left\{\begin{array}{c}{Q}_O-{\mathrm{\&Delta;Q}}_q\&GreaterEqual;Q\\ U_O-{\mathrm{\&Delta;U}}_u<U<U_O\end{array}\right.;$

Tenth district: provincial characteristics $\left\{\begin{array}{c}{Q}_O-{\mathrm{\&Delta;Q}}_q<Q\&le;Q_O\\ U_O-{\mathrm{\&Delta;U}}_u<U<U_O\end{array}\right.;$

Shi Yi district: provincial characteristics $\left\{\begin{array}{c}{Q}_O<Q<Q_O+{\mathrm{\&Delta;Q}}_q\\ U_O-{\mathrm{\&Delta;U}}_u<U\&le;U_O\end{array}\right.;$

No.12 District: provincial characteristics $\left\{\begin{array}{c}Q\&GreaterEqual;Q_O+{\mathrm{\&Delta;Q}}_q\\ U_O-{\mathrm{\&Delta;U}}_u<U\&le;U_O\end{array}\right.;$

Shi San district: provincial characteristics $\left\{\begin{array}{c}Q\&le;Q_O-{\mathrm{\&Delta;Q}}_q\\ U\&le;U_O-{\mathrm{\&Delta;U}}_u\end{array}\right.;$

Shi Si district: provincial characteristics $\left\{\begin{array}{c}{Q}_O-{\mathrm{\&Delta;Q}}_q<Q\&le;Q_O\\ U\&le;U_O-{\mathrm{\&Delta;U}}_u\end{array}\right.;$

Shi Wu district: provincial characteristics $\left\{\begin{array}{c}{Q}_O<Q<Q_O+{\mathrm{\&Delta;Q}}_q\\ U\&le;U_O-{\mathrm{\&Delta;U}}_u\end{array}\right.;$

16th district: provincial characteristics $\left\{\begin{array}{c}Q\&GreaterEqual;Q_O+{\mathrm{\&Delta;Q}}_q\\ U\&le;U_O-{\mathrm{\&Delta;U}}_u\end{array}\right.;$

Wherein, the O point is the optimized operation state of electrical network, U _OBe the voltage of optimized operation state, Q _OBe the reactive power of optimized operation state, Q is the reactive power under the current running status of system, and U is the voltage under the current running status of system, Δ Q _qBe the idle work variable quantity that switching one group capacitor causes, Δ U _uFor the tap of regulating on-load tap-changing transformer (2) changes one grade of voltage variety that causes.

5. the idle composite coordination control method of a kind of line voltage of generation of electricity by new energy according to claim 4, is characterized in that, described in step 2,16 district figure control strategies are:

One district's strategy:

(1) if F _out≠ 0, calculate M.m=|Q ⁽⁰⁾-Q _O|/Δ Q _q(i) if M≤F _out, voltage power-less composite coordination controller (1) sends instruction excision M group capacitor; (ii) if M〉F _out, voltage power-less composite coordination controller (1) sends instruction excision F _outGroup capacitor;

(2) if F _out=0, voltage power-less composite coordination controller (1) sends instruction makes silent oscillation dynamic reactive generator (4) send reactive power compensation amount Q _SVG=Q ⁽⁰⁾-Q _O

Two district's strategies:

(1) if Q _O-Q ⁽⁰⁾Q _ε, entering idle controlling unit, voltage power-less composite coordination controller (1) sends instruction makes silent oscillation dynamic reactive generator (4) send reactive power compensation amount Q _SVG=Q ⁽⁰⁾-Q _O

(2) if Q _O-Q ⁽⁰⁾≤ Q _ε, enter the voltage control link, if (i) k=k _maxAnd N=N _maxIn have an establishment at least, voltage power-less composite coordination controller (1) sends instruction makes dynamic electric voltage recovery device (5) send voltage compensation U _DVR=U _O-U ⁽⁰⁾(ii) if k＜k _maxAnd N＜N _max, voltage power-less composite coordination controller (1) sends the tap that instruction makes on-load tap-changing transformer (2) and rises one grade;

Three district's strategies:

(1) if k=k _maxAnd N=N _maxIn have an establishment at least, voltage power-less composite coordination controller (1) sends instruction makes dynamic electric voltage recovery device (5) produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

(2) if k＜k _maxAnd N＜N _max, voltage power-less composite coordination controller (1) sends the tap that instruction makes on-load tap-changing transformer (2) and rises one grade;

Four district's strategies:

(1) if k=k _maxAnd N=N _maxIn have an establishment at least, voltage power-less composite coordination controller (1) sends instruction makes dynamic electric voltage recovery device (5) produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

(2) if k＜k _maxAnd N＜N _max, voltage power-less composite coordination controller (1) sends the tap that instruction makes on-load tap-changing transformer (2) and rises one grade;

Five district's strategies:

(1) if F _out≠ 0, M.m=|Q ⁽⁰⁾-Q _O|/Δ Q _qIf, (i) M≤F _out, voltage power-less composite coordination controller (1) sends instruction excision M group capacitor; (ii) if M〉F _out, voltage power-less composite coordination controller (1) sends instruction excision F _outGroup capacitor;

(2) if F _out=0, voltage power-less composite coordination controller (1) sends instruction makes silent oscillation dynamic reactive generator (4) send reactive power compensation amount Q _SVG=Q ⁽⁰⁾-Q _O

Six district's strategies:

(1) if Q _O-Q ⁽⁰⁾Q _ε, entering idle controlling unit, voltage power-less composite coordination controller (1) sends instruction makes silent oscillation dynamic reactive generator (4) send reactive power compensation amount Q _SVG=Q ⁽⁰⁾-Q _O

(2) if Q _O-Q ⁽⁰⁾≤ Q _ε, entering the voltage control link, voltage power-less composite coordination controller (1) sends instruction makes dynamic electric voltage recovery device (5) produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

Seven district's strategies:

Voltage power-less composite coordination controller (1) sends instruction makes dynamic electric voltage recovery device (5) produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

Eight district's strategies:

Voltage power-less composite coordination controller (1) sends instruction makes dynamic electric voltage recovery device (5) produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

Nine district's strategies:

Voltage power-less composite coordination controller (1) sends instruction makes dynamic electric voltage recovery device (5) produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

Ten district's strategies:

Voltage power-less composite coordination controller (1) sends instruction makes dynamic electric voltage recovery device (5) produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

Shi Yi district strategy:

(1) if Q ⁽⁰⁾-Q _OQ _ε, entering idle controlling unit, voltage power-less composite coordination controller (1) sends instruction makes silent oscillation dynamic reactive generator (4) send reactive power compensation amount Q _SVG=Q ⁽⁰⁾-Q _O

(2) if Q ⁽⁰⁾-Q _O≤ Q _ε, enter the voltage control link.Voltage power-less composite coordination controller (1) sends instruction makes dynamic electric voltage recovery device (5) produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

The No.12 District strategy:

(1) if F _in=0, voltage power-less composite coordination controller (1) sends instruction makes silent oscillation dynamic reactive generator (4) send reactive power compensation amount Q _SVG=Q ⁽⁰⁾-Q _O

(2) if F _in≠ 0, calculate M.m=|Q ⁽⁰⁾-Q _O|/Δ Q _q

(i) if M≤F _in, voltage power-less composite coordination controller (1) sends instruction and drops into the M group capacitor;

(ii) if M〉F _in, voltage power-less composite coordination controller (1) sends instruction and drops into F _inGroup capacitor;

Shi San district strategy:

(1) if k=k _minAnd N=N _maxIn have an establishment at least, voltage power-less composite coordination controller (1) sends instruction makes dynamic electric voltage recovery device (5) produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

(2) if k ≠ k _minAnd N ≠ N _max, voltage power-less composite coordination controller (1) sends the tap that instruction makes on-load tap-changing transformer (2) and falls one grade;

Shi Si district strategy:

(1) if k=k _minAnd N=N _maxIn have an establishment at least, voltage power-less composite coordination controller (1) sends instruction makes dynamic electric voltage recovery device (5) produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾

(2) if k ≠ k _minAnd N ≠ N _max, voltage power-less composite coordination controller (1) sends the tap that instruction makes on-load tap-changing transformer (2) and falls one grade;

Shi Wu district strategy:

(1) if Q ⁽⁰⁾-Q _OQ _ε, entering idle controlling unit, voltage power-less composite coordination controller (1) sends instruction makes silent oscillation dynamic reactive generator (4) send reactive power compensation amount Q _SVG=Q ⁽⁰⁾-Q _O

(2) if Q ⁽⁰⁾-Q _O≤ Q _ε, enter the voltage control link, if (i) k=k _minAnd N=N _maxIn have an establishment at least, voltage power-less composite coordination controller (1) sends instruction makes dynamic electric voltage recovery device (5) produce voltage compensation quantity U _DVR=U _O-U ⁽⁰⁾(ii) if k ≠ k _minAnd N ≠ N _max, voltage power-less composite coordination controller (1) sends the tap that instruction makes on-load tap-changing transformer (2) and falls one grade;

16 district's strategies:

(1) if F _in=0, voltage power-less composite coordination controller (1) sends instruction makes silent oscillation dynamic reactive generator (4) send reactive power compensation amount Q _SVG=Q ⁽⁰⁾-Q _O

(2) if F _in≠ 0, calculate M.m=|Q ⁽⁰⁾-Q _O|/Δ Q _q(i) if M≤F _in, voltage power-less composite coordination controller (1) sends instruction and drops into the M group capacitor; (ii) if M〉F _in, voltage power-less composite coordination controller (1) sends instruction and drops into F _inGroup capacitor;

Wherein, total group of number of capacitor group (3) is F _in+ F _outM.m is | Q ⁽⁰⁾-Q _O|/Δ Q _qNumerical value, wherein M representative | Q ⁽⁰⁾-Q _O|/Δ Q _qInteger part, m representative | Q ⁽⁰⁾-Q _O|/Δ Q _qFractional part; The tap upper limit position of on-load tap-changing transformer (2) is k _max, the lower position is k _min

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