CN101034811A - Security adjusting and control method for top layer of the static mixed automatic voltage control - Google Patents

Abstract

The invention belongs to the electrical network voltage idle work automatic control technology area, its characteristic lies in after the kth sampling gap, takes the static voltage minimum safety index minref[k] of the electrical power system as the given value, stabilization control the minimum mold character min [k] of the electrical power system Jacobian matrix, when min[k]-minref[k] is smaller than hypothesis the system smallest difference value safe starts optimized control, based on the remended min[k] adjust each essential generatrix pitch point change quantity VPi[k], causes min [ k ] - minref [ k ]to be bigger than the system smallest difference value safe, thus realized the safty coordinated optimization control of the electrical power system generatrix voltage, enhanced the voltage secure level.

Description

Static state blendes together the top security adjusting and control method of automatism voltage control

Technical field

Present technique is invented the voltage power-less autocontrol method in large area electrical network, provincial power network and the area power grid that belongs to electric power system.

Background technology

The appearance that power system development impels people constantly to make great efforts to improve fail safe and stability, the especially electricity market of electric power system is had higher requirement to the stability of electric power system, and makes the safe and stable operation problem of electric power system have new characteristics.General station, power plant is away from load center, but because the factor of economy and environmental protection etc., on the one hand, the development of some electric power networks does not catch up with the needs that electric load increases fast, makes some transmission lines be in heavy duty or overload operation state; On the other hand, the enforcement of electricity market will make the amount of rising and falling of load and the randomness of variation strengthen.Therefore keep the system voltage level, the voltage stability that improves quality of voltage and maintenance system becomes one and has challenging problem.

Under such background, the present invention will blend together the theory of automatic control system and introduce voltage control, be driving with the discrete event, propose static state and blend together the top security adjusting and control method of automatism voltage control just, realize the fail safe control to voltage.

Summary of the invention

The invention is characterized in provides static state to blend together the top security adjusting and control method of automatism voltage control.

The invention is characterized in that this method blendes together in static state that the top security adjusting and control computer of automatism voltage control realizes according to following steps successively:

Step (1): initialization

Set: the 1. network parameter of electric power system, comprising series resistance, series reactance, shunt conductance and the shunt susceptance of transmission line; The no-load voltage ratio of transformer and impedance; Be connected in parallel on the capacitor on the transmission line and the impedance of reactor; The title of the bus nodes of electric power system;

2. in all bus nodes, set the number α of critical busses node P _P, the corresponding bus lines name, and the voltage control quantity Δ V of each critical busses node _Pi[k], wherein i is the sequence number of critical busses node, i=1 ..., α _P, k is the sequence number of sampling instant, down together;

3. the quiescent voltage minimum safety stability index λ of electric power system _Min ^Ref[k], and the minimum difference value Δ λ of this system _Safe, the relative electric power system tide of the magnitude of voltage of each critical busses node calculates the minimum eigenvalue λ of Jacobian matrix in addition _MinSensitivity

V wherein _PiBe the voltage of critical busses node i, i=1 ..., α _P,

Given: the real-time measurement data of electric power system, comprising voltage, electric current, active power and the reactive power of each bus nodes;

Step (2): the current time after k sampling interval, according to voltage voltage, electric current and the active power of given each bus nodes of electric power system and the numerical value of reactive power, and the network parameter of electric power system forms the current power system and carries out trend used Jacobian matrix when calculating

Step (3): the amplitude λ of the minimum eigenvalue of the described Jacobian matrix of calculation procedure (2) _Min[k], this numerical value are current power system voltage safety indexes,

Step (4): according to the described λ of step (3) _Min[k] and the quiescent voltage safety indexes λ that has set _Min ^RefDifference between [k] constitutes the outgoing event E that voltage security is judged link by following logical condition _Safe[k] judges whether automatically and the formation incident go drive controlling.

$E_{\mathrm{safe}}\left[k\right]=\left\{\begin{array}{ccc}{P}_{\mathrm{scon}},& \mathrm{if}& {\mathrm{\&lambda;}}_{\min }\left[k\right]-{\mathrm{\&lambda;}}_{\min }^{\mathrm{ref}}\left[k\right]<\mathrm{\&Delta;}{\mathrm{\&lambda;}}_{\mathrm{safe}},\\ P_{\mathrm{snon}},& \mathrm{if}& {\mathrm{\&lambda;}}_{\min }\left[k\right]-{\mathrm{\&lambda;}}_{\min }^{\mathrm{ref}}\left[k\right]\&GreaterEqual;{\mathrm{\&Delta;\&lambda;}}_{\mathrm{safe}},\end{array}\right.$

P wherein _SconRepresent current needs to carry out voltage security control,

P _SnonRepresent the current voltage security control that do not need to carry out;

Step (5): when ${\mathrm{\&lambda;}}_{\min }\left[k\right]-{\mathrm{\&lambda;}}_{\min }^{\mathrm{ref}}\left[k\right]<{\mathrm{\&Delta;\&lambda;}}_{\mathrm{safe}}$ The time, set that the Jacobian matrix need increase the amplitude of the minimum eigenvalue be

Δλ _min[k]＝2×Δλ _safe；

Step (6): establish each critical busses node voltage P for V _Pi[k] is according to the relative Jacobian matrix of described each the critical busses node the minimum eigenvalue λ that sets _MinVoltage sensibility

Obtain the controlled quentity controlled variable Δ V of described each critical busses node by finding the solution following optimization problem _Pi[k]

$\min z=\left(\right|{\mathrm{\&Delta;\&lambda;}}_{\min }\left[k\right]-\underset{i=1}{\overset{{\mathrm{\&alpha;}}_P}{\mathrm{\&Sigma;}}}\left(\frac{{\&PartialD;\mathrm{\&lambda;}}_{\min }}{{\&PartialD;V}_{\mathrm{Pi}}}\right)\&CenterDot;{\mathrm{\&Delta;V}}_{\mathrm{Pi}}\left[k\right]\left|\right)+\underset{i=1}{\overset{{\mathrm{\&alpha;}}_P}{\mathrm{\&Sigma;}}}\left|{\mathrm{\&Delta;V}}_{\mathrm{Pi}}\right[k\left]\right|$

Wherein ${\mathrm{\&Delta;V}}_{\mathrm{Pi}}\left[k\right]=V_{\mathrm{Pi}}^{\mathrm{ref}}\left[k\right]-V_{\mathrm{Pi}}\left[k\right],$ i＝1，…，α _P，

V _Pi ^Ref[k] is the setting reference value of the modification of each critical busses node, i=1 ..., α _P,

V _Pi[k] is the voltage measured value of each critical busses node, i=1 ..., α _P

Step (7): the voltage control quantity Δ V that obtains in the step (6) _Pi[k] exports as control command.

The present invention is according to continuous dynamic process that moves and discrete control command, the interactional characteristics of discrete operations in the electric power system, to blend together control system and introduce the quiescent voltage control of electric power system, and propose static state and blended together the top security adjusting and control method of automatism voltage control.As driving, logical order and continuous dynamic process interaction can realize the automatic synchronization optimal control to the system voltage fail safe, thereby guarantee voltage security with discrete event in the present invention.Particularly, following advantage is arranged:

1) to blend together the top security adjusting and control method of automatism voltage control be that incident (Events) drives to the static state that proposes of the present invention, control command corresponds directly to incident and reaches the purpose of eliminating this incident, and existing other voltage control scheme all starts with setting-up time;

2) static state that proposes of the present invention blendes together the top security adjusting and control method of automatism voltage control and all guarantees power system voltage safety indexes λ in any moment of system _Min[k] and quiescent voltage minimum safety stability index λ _Min ^RefDifference between [k] all surpasses Δ λ _Safe, this means that electric power system all surpasses Δ λ apart from the distance in quiescent voltage safety and stability territory at any time _Safe

The static state that the present invention proposes blendes together the static state that the top security adjusting and control method of automatism voltage control can be useful for each big zone of China and provincial and regional power system and blendes together among the automatic voltage control system, and produces great economic and social benefit.

Description of drawings

Fig. 1. the hardware platform of the method for the invention.

Fig. 2. the program flow chart of the method for the invention.

Fig. 3 .6 machine 22 bus-bar system winding diagrams.

Embodiment

The present invention as driving, blendes together that automatism voltage control is top can be realized the fail safe coordination optimization of system voltage control (as shown in Figure 1) with discrete event in static state, and can calculate automatically and regulate and control by computer.

This invention comprises following step (flow process is referring to Fig. 2):

Step 1: under off-line state, provide the index of aspects such as the relevant voltage security of electric power system and the parameter of system, specifically comprise: (a) the quiescent voltage minimum safety stability index λ of electric power system _Min ^Ref[k]; (b) the minimum difference value Δ λ that sets of electric power system _Safe(c) the number α of given key node P _PAnd corresponding bus lines name; (d) provide the relative the minimum eigenvalue λ of each key node _MinVoltage sensibility

(e) grid parameter.

Step 2: voltage voltage, electric current and the active power of given each bus nodes of electric power system, the real-time numerical value of reactive power;

Step 3: according to the numerical value of voltage voltage, electric current, active power and the reactive power of given each bus nodes of electric power system, and the power system network parameter, form the current power system load flow and calculate the Jacobian matrix that uses;

Step 4: the amplitude λ that calculates the minimum eigenvalue of this matrix then _Min[k], this numerical value are current power system voltage safety indexes;

Step 5: according to λ _Min[k] and the quiescent voltage minimum safety stability index λ that has configured _Min ^RefDifference size between [k] constitutes " incident " by the logical condition that provides, and judges whether automatically the formation incident go drive controlling;

Step 6: if the incident that forms is P _Snon, the then static control command that blendes together the top fail safe controlling unit output of automatism voltage control is 0;

Step 7: if the incident that forms is P _Scon, then static state blendes together the controlled quentity controlled variable Δ V that each key node P was calculated and formed to the top fail safe controlling unit of automatism voltage control _Pi[k];

Step 8: the controlled quentity controlled variable Δ V of each key node P _Pi[k] is as the output of control command;

The effect of the static hybrid automatic voltage control method that proposes in order to verify, we carry out Computer Simulation research, and emulation test system adopts 6 machines, 22 bus-bar systems (as shown in Figure 3).

Set: at k=0 constantly, (a) the emulation test system network parameter sees Table 1, (b) the quiescent voltage minimum safety stability index of electric power system ${\mathrm{\&lambda;}}_{\min }^{\mathrm{ref}}\left[k\right]=5.2;$ (c) the minimum difference value Δ λ that sets of electric power system _Safe=0.2; (d) given key node number is 2, is respectively No. 11 node buses and No. 16 node buses; (e) provide the relative the minimum eigenvalue λ of key node No. 11 _MinVoltage sensibility ${\&PartialD;\mathrm{\&lambda;}}_{\min }/{\&PartialD;V}_{P-11}=3.7443,$ No. 16 relative the minimum eigenvalue λ of key node _MinVoltage sensibility

${\&PartialD;\mathrm{\&lambda;}}_{\min }/{\&PartialD;V}_{P-16}=2.9338;$

Given: voltage voltage, electric current and the active power of this each bus nodes of system and the real-time numerical value of reactive power see Table 2;

System enters static state and blendes together the top security adjusting and control link of automatism voltage control.This link employing " static state blendes together the top security adjusting and control method of automatism voltage control " is judged voltage security and is handled.(a) calculate k=0 power system voltage safety indexes λ constantly _Min[0]=5.08; (b) because ${\mathrm{\&lambda;}}_{\min }\left[0\right]-{\mathrm{\&lambda;}}_{\min }^{\mathrm{ref}}\left[0\right]=5.08-5.2=-0.12<0.2={\mathrm{\&Delta;\&lambda;}}_{\mathrm{safe}},$ So the static incident that blendes together the top security adjusting and control link formation of automatism voltage control is P _Scon(c) therefore needing the amplitude of the minimum eigenvalue of increase is Δ λ _Min[0]=2 * Δ λ _Safe(d) the controlled quentity controlled variable Δ V of No. 11 key nodes is calculated and obtained to security of system regulation and control link _P-11[0]=0.0528, the controlled quentity controlled variable Δ V of No. 16 key node _P-16[0]=0.0414.

After control command issued, electric power system moved adjustment.Obtain the voltage V of No. 11 key nodes constantly at k=1 _P-11[1]=1.06053, the voltage V of No. 16 key node _P-16[1]=1.03934.System enters static state once more and blendes together the top security adjusting and control link of automatism voltage control.(a) calculate k=1 power system voltage safety indexes λ constantly _Min[1]=5.41; (b) because ${\mathrm{\&lambda;}}_{\min }\left[1\right]-{\mathrm{\&lambda;}}_{\min }^{\mathrm{ref}}\left[1\right]=5.41-5.2=0.12>0.2={\mathrm{\&Delta;\&lambda;}}_{\mathrm{safe}},$ So the static incident that blendes together the top security adjusting and control link formation of automatism voltage control is P _Snon(c) to blend together the control command of the top security adjusting and control link of automatism voltage control output be 0 to static state;

Emulation testing is the result show: static state blendes together the voltage security index λ in any moment that the top security adjusting and control method of automatism voltage control makes electric power system _Min[k] and quiescent voltage minimum safety stability index λ _Min ^RefDifference between [k] all surpasses Δ λ _Safe, guaranteed the fail safe of system.

Table 1. line parameter circuit value

Bus I	Bus J	R	X	B/N *
					1	7	0.0000	0.0150	1.050 *
2	9	0.0000	0.0217	1.075 *
					3	22	0.0000	0.0124	1.100 *
4	19	0.0000	0.0640	1.025 *
					5	18	0.0000	0.0375	1.050 *
6	17	0.0000	0.0337	1.000 *
					7	8	0.0106	0.0740	0.0000
7	9	0.0147	0.0104	0.0000
					8	9	0.0034	0.0131	0.0000
8	22	0.0537	0.1900	-0.1653

9	10	0.0000	-0.0020	1.000 *
					9	22	0.0599	0.2180	-0.1954
10	11	0.0000	0.0180	1.000 *
					11	11	0.0000	0.7318	0.0000
11	12	0.0033	0.0343	-1.8797
					12	12	0.0000	0.7318	0.0000
15	12	0.0000	0.0180	1.000 *
					12	13	0.0024	0.0255	-1.3950
17	13	0.0000	0.0100	1.000 *
					14	15	0.0000	-0.0020	1.000 *
14	19	0.0034	0.0200	0.0000
					16	16	0.0000	-1.9930	0.0000
17	16	0.0000	0.0010	1.027 *
					16	18	0.0033	0.0333	0.0000
16	19	0.0578	0.2180	-0.1807
					16	20	0.0165	0.0662	-0.2353
16	21	0.0374	0.1780	-0.1640
					19	21	0.0114	0.0370	0.0000
20	22	0.0214	0.0859	-0.3008
					21	22	0.0150	0.0607	-0.2198

Table 2. flow data

Bus	P g	V t/Q g *	P load	Q load
					1	6.0	1.0	0.0	0.0
2	6.0	3.2 *	0.0	0.0
					3	3.1	1.0	0.0	0.0
4	1.6	0.7 *	0.0	0.0
					5	4.3	3.34 *	0.0	0.0
6	-0.01	1.0	0.0	0.0
					8	0.0	0.0 *	2.87	1.44
9	0.0	0.0 *	3.76	2.21
					16	0.0	0.0 *	5.0	2.9
18	0.0	0.0 *	4.3	2.6
					19	0.0	0.0 *	0.864	0.662
20	0.0	0.0 *	0.72	0.47
					21	0.0	0.0 *	0.7	0.5
22	0.0	0.0 *	2.26	1.59

Claims (1)

1, static state blendes together the top security adjusting and control method of automatism voltage control, it is characterized in that, this method blendes together in the top security adjusting and control computer of automatism voltage control in static state and realizes according to the following steps successively:

Step (1): initialization

Set: the 1. network parameter of electric power system, comprising series resistance, series reactance, shunt conductance and the shunt susceptance of transmission line; The no-load voltage ratio of transformer and impedance; Be connected in parallel on the capacitor on the transmission line and the impedance of reactor; The title of the bus nodes of electric power system;

2. in all bus nodes, set the number α of critical busses node P _P, the corresponding bus lines name, and the voltage control quantity Δ V of each critical busses node _Pi[k], wherein i is the sequence number of critical busses node, i=1 ..., α _P, k is the sequence number of sampling instant, down together;

3. the quiescent voltage minimum safety stability index λ of electric power system _Min ^Ref[k], and the minimum difference value Δ λ of this system _Safe, the relative electric power system tide of the magnitude of voltage of each critical busses node calculates the minimum eigenvalue λ of Jacobian matrix in addition _MinSensitivity  λ _Min/  V _Pi, V wherein _PiBe the voltage of critical busses node i, i=1 ..., α _P,

Given: the real-time measurement data of electric power system, comprising voltage, electric current, active power and the reactive power of each bus nodes;

Step (2): the current time after k sampling interval, according to voltage voltage, electric current and the active power of given each bus nodes of electric power system and the numerical value of reactive power, and the network parameter of electric power system forms the current power system and carries out trend used Jacobian matrix when calculating

Step (3): the amplitude λ of the minimum eigenvalue of the described Jacobian matrix of calculation procedure (2) _Min[k], this numerical value are current power system voltage safety indexes,

Step (4): according to the described λ of step (3) _Min[k] and the quiescent voltage safety indexes λ that has set _Min ^RefDifference between [k] constitutes the outgoing event E that voltage security is judged link by following logical condition _Safe[k] judges whether automatically and the formation incident go drive controlling.

$E_{\mathrm{safe}}\left[k\right]=\left\{\begin{array}{ccc}{P}_{\mathrm{scon}},& \mathrm{if}& {\mathrm{\&lambda;}}_{\min }\left[k\right]-{\mathrm{\&lambda;}}_{\min }^{\mathrm{ref}}\left[k\right]<\mathrm{\&Delta;}{\mathrm{\&lambda;}}_{\mathrm{safe}},\\ P_{\mathrm{snon}},& \mathrm{if}& {\mathrm{\&lambda;}}_{\min }\left[k\right]-{\mathrm{\&lambda;}}_{\min }^{\mathrm{ref}}\left[k\right]\&GreaterEqual;{\mathrm{\&Delta;\&lambda;}}_{\mathrm{safe}},\end{array}\right.$

P wherein _SconRepresent current needs to carry out voltage security control,

P _SnonRepresent the current voltage security control that do not need to carry out;

Step (5): when ${\mathrm{\&lambda;}}_{\min }\left[k\right]-{\mathrm{\&lambda;}}_{\min }^{\mathrm{ref}}\left[k\right]<\mathrm{\&Delta;}{\mathrm{\&lambda;}}_{\mathrm{safe}}$ The time, set that the Jacobian matrix need increase the amplitude of the minimum eigenvalue be

Δλ _min[k]＝2×Δλ _safe；

Step (6): establish each critical busses node voltage P for V _Pi[k] is according to the relative Jacobian matrix of described each the critical busses node the minimum eigenvalue λ that sets _MinVoltage sensibility  λ _Min/  V _Pi, obtain the controlled quentity controlled variable Δ V of described each critical busses node by finding the solution following optimization problem _Pi[k]

$\min z=\left(\right|{\mathrm{\&Delta;\&lambda;}}_{\min }\left[k\right]-\underset{i=1}{\overset{{\mathrm{\&alpha;}}_P}{\mathrm{\&Sigma;}}}\left(\frac{{\&PartialD;\mathrm{\&lambda;}}_{\min }}{{\&PartialD;V}_{\mathrm{Pi}}}\right)\&CenterDot;{\mathrm{\&Delta;V}}_{\mathrm{Pi}}\left[k\right]\left|\right)+\underset{i=1}{\overset{{\mathrm{\&alpha;}}_P}{\mathrm{\&Sigma;}}}\left|{\mathrm{\&Delta;V}}_{\mathrm{Pi}}\right[k]|$

Wherein ${\mathrm{\&Delta;V}}_{\mathrm{Pi}}\left[k\right]=V_{\mathrm{Pi}}^{\mathrm{ref}}\left[k\right]-V_{\mathrm{Pi}}\left[k\right],$ i＝1，…，α _P，

V _Pi ^Ref[k] is the setting reference value of the modification of each critical busses node, i=1 ..., α _P,

V _Pi[k] is the voltage measured value of each critical busses node, i=1 ..., α _P

Step (7): the voltage control quantity Δ V that obtains in the step (6) _Pi[k] exports as control command.

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