CN116544961A - Subsynchronous resonance suppression method, subsynchronous resonance suppression device, electronic equipment and storage medium - Google Patents
Subsynchronous resonance suppression method, subsynchronous resonance suppression device, electronic equipment and storage medium Download PDFInfo
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- H—ELECTRICITY
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Abstract
The invention provides a subsynchronous resonance suppression method, a subsynchronous resonance suppression device, electronic equipment and a storage medium, and belongs to the field of stable operation of power systems, wherein the subsynchronous resonance suppression method comprises the following steps: and acquiring a second-order transfer function G(s) controlled by the system VSG and an improved system transfer function G'(s) after a damping link is added, wherein the system transfer function comprises damping compensation parameters, acquiring system frequency and an energy storage system SOC, adjusting the damping compensation parameters based on an inertia constant and the damping coefficient when the energy storage system SOC is in a first range, adjusting the system inertia coefficient based on the system frequency, and adjusting the system inertia coefficient based on the energy storage system SOC when the energy storage system SOC is not in the first range. The invention can prolong the service life of energy storage and improve the operation stability of the double-high power grid.
Description
Technical Field
The invention belongs to the field of stable operation of power systems, and particularly relates to a subsynchronous resonance suppression method, a subsynchronous resonance suppression device, electronic equipment and a storage medium.
Background
The new energy mainly comprising clean energy such as solar energy, wind energy and the like is greatly developed, and the power grid in China gradually forms the double-high characteristic containing high-proportion renewable energy and high-proportion power electronic equipment. With the development of modern power electronic technology, the distributed power generation technology based on renewable energy sources is applied on a large scale, so that the running economy and flexibility of the power system are greatly enhanced, but the capacity ratio of the synchronous generator in the power system is gradually reduced due to the improvement of the permeability of the renewable energy sources, so that the overall inertia of the power system is greatly reduced, and the robustness of the power system is reduced.
The virtual synchronous generator (Virtual Synchronous Generator, VSG) technology can effectively improve frequency stability by introducing virtual inertia to simulate the rotor motion behavior of the VSG. But introduces virtual inertia while reducing system damping, making VSG prone to active power oscillations. In order to suppress the power oscillation, it is common practice to introduce damping feedback to form an inertia damping integrated controller of the VSG, simulating the inertia damping characteristics of the synchronous generator. When the VSG is operated in a PQ mode in a grid-connected mode, the dynamic and static characteristics of the system frequency supporting capacity and active power are determined by the VSG inertia damping characteristics. If the inertia coefficient is large, the VSG frequency supporting capacity is enhanced, but the active power overshoot is increased, the adjusting time is prolonged and increased, the system damping is reduced at the same time, and the power oscillation is possibly caused; and if the damping coefficient is large, the active power overshoot is small, the damping effect is good, but a larger steady-state active power error is caused.
Although the inertia and frequency support control technology of various novel sources, loads, storage interfaces and direct current transmission system converters can improve the inertia response capability of a power system and reduce the safe operation pressure of a large power grid, how to realize the estimation of the inertia level space-time characteristics in the inertia response process of the system under the background of a double-high power system with high-proportion new energy and high-proportion power electronization, and further adjust the coordination and coordination of the inertia support response of each part of the system so as to meet various stability constraint conditions and improve the safe and stable operation capability of the system is still a problem to be solved.
Disclosure of Invention
In view of the above, the embodiments of the present invention provide a method, an apparatus, an electronic device, and a storage medium for suppressing sub-synchronous resonance, so as to solve the problem that the VSG control scheme in the prior art cannot satisfy various stability constraint conditions in a novel power system with "dual high" characteristics, and has a sub-synchronous resonance phenomenon.
In a first aspect, an embodiment of the present invention provides a method for suppressing subsynchronous resonance, including:
acquiring a second-order transfer function G(s) controlled by a system virtual synchronous generator VSG and an improved system transfer function G'(s) after a damping link is added; wherein the system transfer function includes a damping compensation parameter;
acquiring a system frequency and a State of Charge (SOC) of an energy storage system;
when the energy storage system SOC is in a first range, adjusting the damping compensation parameter based on an inertia constant and a damping coefficient, and adjusting a system inertia coefficient based on a system frequency;
and when the energy storage system SOC is not in the first range, adjusting the system inertia coefficient based on the energy storage system SOC.
In one possible implementation, the damping compensation parameter includes a proportional coefficient and a derivative coefficient, and the improved system transfer function G'(s) is:
Wherein K is pp The proportion coefficient of the damping compensation link is used; k (K) PD The differential coefficient of the damping compensation link; x is X g ＝ωL g ，X g Line side inductance, namely line inductance from the LC filter outlet to the PCC point; omega is the angular velocity of the system; u (U) n The voltage amplitude value is the alternating current side voltage amplitude value of the inverter; u (U) g The amplitude of the alternating voltage is PCC; l (L) c ＝L g +L o ，L c Second order coefficients for transfer functions; l (L) g The equivalent inductance of the circuit; l (L) o ＝(1-J)/K v1 ，L o An open loop gain that is an inner loop transfer function, the magnitude of which represents the magnitude of the output impedance; k (K) v1 The integral coefficient of the voltage controller PI; j is a system inertia coefficient; r is R g Is the equivalent resistance of the circuit; s is the Laplace operator.
In one possible implementation, the adjusting the damping compensation parameter based on the inertia constant and the damping coefficient includes:
adjusting a proportional coefficient and a differential coefficient based on the inertia constant and the damping coefficient;
wherein the proportional and differential coefficient expressions are:
wherein K is pp The proportion coefficient of the damping compensation link is used; k (K) PD The differential coefficient of the damping compensation link; d is a damping coefficient; m=jω, M being the inertial torque; omega is the angular velocity of the system; j is a system inertia coefficient; k (k) 1 And k 2 For adjusting the coefficients; x is X g ＝ωL g ，X g Line side inductance, namely line inductance from the LC filter outlet to the PCC point; u (U) n The voltage amplitude value is the alternating current side voltage amplitude value of the inverter; u (U) g The amplitude of the alternating voltage is PCC; l (L) c ＝L g +L o ，L c Second order coefficients for transfer functions; l (L) g The equivalent inductance of the circuit;L o ＝(1-H)/K v1 ，L o an open loop gain that is an inner loop transfer function, the magnitude of which represents the magnitude of the output impedance; k (K) v1 The integral coefficient of the voltage controller PI; r is R g Is the equivalent resistance of the circuit; p (P) n ＝X g U n U g ，P n Is a molecular term of the transfer function of the system.
In one possible implementation, when the energy storage system SOC is within a first range, the system inertia coefficient is expressed as:
wherein J is 0 The inertia is the inertia when the system operates normally; k (k) 5 And k 6 For adjusting the coefficients; Δk x Step length is adjusted for the parameters; beta is the system frequency fluctuation threshold; f is the system frequency; t is time; a is an exponential function coefficient;
the adjusting the system inertia coefficient based on the system frequency comprises the following steps: and adjusting an exponential function coefficient A in the system inertia coefficient based on the system frequency, wherein the expression is as follows:
wherein f m Is rated frequency; f is the real-time frequency; Δf defines a maximum fluctuation value for the system frequency.
In one possible implementation, the adjusting the system inertia coefficient based on the energy storage system SOC includes:
when the energy storage system SOC is smaller than the first range lower limit value, the system inertia coefficient is:
J＝k 3 SOC B J 0
Wherein k is 3 B is an adjustment coefficient when the SOC of the energy storage system is smaller than the lower limit value of the first range; j (J) 0 The inertia is the inertia when the system is operating normally.
In one possible implementation manner, the adjusting the system inertia coefficient based on the energy storage system SOC includes:
when the energy storage system SOC is greater than the first range upper limit, the system inertia coefficient is:
J＝k 4 (1-SOC) C J 0
wherein k is 4 And C is an adjustment coefficient when the SOC of the energy storage system is greater than the upper limit value of the first range; j (J) 0 The inertia is the inertia when the system is operating normally.
In one possible implementation, the second order transfer function G(s) is expressed as:
wherein X is g ＝ωL g ，X g Line side inductance, namely line inductance from the LC filter outlet to the PCC point; omega is the angular velocity of the system; u (U) n The voltage amplitude value is the alternating current side voltage amplitude value of the inverter; u (U) g The amplitude of the alternating voltage is PCC; l (L) c ＝L g +L o ，L c Second order coefficients for transfer functions; l (L) g The equivalent inductance of the circuit; l (L) o ＝(1-H)/K v1 ，L o An open loop gain that is an inner loop transfer function, the magnitude of which represents the magnitude of the output impedance; k (K) v1 The integral coefficient of the voltage controller PI; r is R g Is the equivalent resistance of the circuit; s is the Laplace operator.
In a second aspect, an embodiment of the present invention provides a subsynchronous resonance suppression device, including:
the first acquisition module is used for acquiring a second-order transfer function G(s) controlled by the system VSG and an improved system transfer function G'(s) after a damping link is added; wherein the system transfer function includes a damping compensation parameter;
The second acquisition module is used for acquiring the system frequency and the energy storage system SOC;
the adjusting module is used for adjusting the damping compensation parameter based on an inertia constant and a damping coefficient when the SOC of the energy storage system is in a first range and adjusting the inertia coefficient of the system based on the system frequency; the adjustment module is configured to adjust the system inertia coefficient based on the energy storage system SOC when the energy storage system SOC is not within a first range.
In a third aspect, an embodiment of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the subsynchronous resonance suppression method as described above in the first aspect or any one of the possible implementations of the first aspect when the computer program is executed.
In a fourth aspect, embodiments of the present invention provide a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the subsynchronous resonance suppression method as described above in the first aspect or any one of the possible implementations of the first aspect.
The subsynchronous resonance suppression method provided by the embodiment of the invention has the beneficial effects that:
the invention obtains a second-order transfer function G(s) controlled by a system VSG and an improved system transfer function G'(s) after a damping link is added, obtains system frequency and an energy storage system SOC, and provides different control strategies by considering the range of the energy storage system SOC; when the energy storage system SOC is in a first range, the damping compensation parameters are adjusted based on the energy storage system SOC, so that the amplitude of a resonance peak can be restrained, the stability margin is increased, and damping compensation is realized; on the other hand, on the basis of considering the SOC range of the energy storage system, the system inertia coefficient is adjusted by the comprehensive system frequency to provide support for the system frequency, so that the operation stability of the double-high power grid is improved, and subsynchronous oscillation is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an application scenario diagram of a subsynchronous resonance suppression method provided by an embodiment of the present invention;
FIG. 2 is a flowchart of a method for suppressing sub-synchronous resonance according to an embodiment of the present invention;
FIG. 3 is a block diagram of a damping compensation link control structure provided by an embodiment of the present invention;
FIG. 4 is a model topology of a distributed generation-energy storage system with simulation verification provided by an embodiment of the present invention;
FIG. 5 is a comparison of bode plots before and after adding damping compensation for conventional VSG control provided by an embodiment of the present invention;
FIG. 6 is a diagram illustrating the system frequency variation when conventional VSG control is employed in accordance with an embodiment of the present invention;
FIG. 7 is a diagram showing the system frequency variation after adaptive damping compensation according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a sub-synchronous resonance suppression device according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a subsynchronous resonance suppression electronic device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
And analyzing inertia changes of the traditional power grid and the double-high power grid on self and control.
Analyzing the inertia condition of the system from the aspects of new energy and control of the new energy which is accessed into a power grid, wherein the relation between the traditional droop control and the traditional VSG control is as follows:
wherein P is in Is synchronous generator shaft power; p (P) out Is the power of the electricity generation; j is a system inertia coefficient; d is a system damping coefficient; omega m Is the rotor angular velocity; omega 0 Is a reference angular velocity (rated angular velocity); omega g Is the grid angular frequency; k (k) p Is the sag factor.
The invention analyzes resonance peak and subsynchronous oscillation phenomena of a 'double high' power grid under the traditional VSG control, and based on the resonance peak and subsynchronous oscillation phenomena, the embodiment of the invention provides a subsynchronous resonance suppression method, which aims to solve the problem that a VSG control scheme cannot meet various stability constraint conditions in a novel power system with the 'double high' characteristic.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, which shows an application scenario diagram of a subsynchronous resonance suppression method provided by the embodiment of the invention, as shown in fig. 1, an inverter of an optical storage unit comprises LC filter links Lf and Cf, and switching devices Sa1, sb1, sc1, sa2, sb2 and Sc2, a subsynchronous oscillation damping compensation strategy and an adaptive control method are adopted in a control strategy of the inverter of the optical storage unit, a photovoltaic array is a photovoltaic power generation device, a storage battery is used as an energy storage device, the two devices are respectively converged to a direct current bus through a DC/DC converter and then are merged into a system through the DC/AC inverter, LC filtering is performed through control of the switching devices, damping compensation and virtual inertia control are performed through power calculation and voltage reference value calculation, namely, a system damping compensation parameter and a system inertia coefficient are regulated, and a synchronous generator G1 is connected to an inductor Lg and a load Z load And the power supply device is used for meeting the power supply requirement. The invention mainly has the application scene of the problems of low inertia, resonance peak and the like caused by the fact that a new energy power generation device represented by the light storage unit is connected with an alternating current large power grid or a micro power grid, and improves the system stability and the service life of the energy storage unit by improving the inverter control strategy of the light storage unit.
Referring to fig. 2, a flowchart of an implementation of a method for suppressing sub-synchronous resonance according to an embodiment of the present invention is shown, where the method includes the following steps:
s201, acquiring a second-order transfer function G (S) controlled by a system VSG and an improved system transfer function G' (S) after a damping link is added; wherein the system transfer function includes damping compensation parameters.
In one possible implementation, the second order transfer function G(s) is modified by adding damping compensation parameters to its expression, so as to obtain a modified system transfer function G'(s), where the damping compensation parameters include a proportional coefficient and a differential coefficient, and the expression of the second order transfer function G(s) before modification is:
wherein X is g ＝ωL g ，X g Line side inductance, namely line inductance from the LC filter outlet to the PCC point; omega is the angular velocity of the system; u (U) n The voltage amplitude value is the alternating current side voltage amplitude value of the inverter; u (U) g The amplitude of the alternating voltage is PCC; l (L) c ＝L g +L o ，L c Second order coefficients for transfer functions; l (L) g The equivalent inductance of the circuit; l (L) o ＝(1-H)/K v1 ，L o An open loop gain that is an inner loop transfer function, the magnitude of which represents the magnitude of the output impedance; k (K) v1 The integral coefficient of the voltage controller PI; r is R g Is the equivalent resistance of the circuit; s is the Laplace operator.
The improved system transfer function G'(s) is:
wherein K is pp The proportion coefficient of the damping compensation link is used; k (K) PD The differential coefficient of the damping compensation link; x is X g ＝ωL g ，X g Line side inductance, namely line inductance from the LC filter outlet to the PCC point; omega seriesAngular velocity is unified; u (U) n The voltage amplitude value is the alternating current side voltage amplitude value of the inverter; u (U) g The amplitude of the alternating voltage is PCC; l (L) c ＝L g +L o ，L c Second order coefficients for transfer functions; l (L) g The equivalent inductance of the circuit; l (L) o ＝(1-J)/K v1 ，L o An open loop gain that is an inner loop transfer function, the magnitude of which represents the magnitude of the output impedance; k (K) v1 The integral coefficient of the voltage controller PI; j is a system inertia coefficient; r is R g Is the equivalent resistance of the circuit; s is the Laplace operator.
In the embodiment of the invention, a damping compensation strategy based on output power is provided, and by acquiring a second-order transfer function G(s) controlled by a system VSG and improving a damping link of G(s), an improved system transfer function G'(s) is obtained, and under the condition of maintaining almost unchanged system characteristics, the amplitude of a resonance peak is suppressed, and the stability margin is increased, so that damping compensation is realized.
S202, acquiring the system frequency and the state of charge (SOC) of the energy storage system.
In one possible implementation manner, the acquiring the SOC of the energy storage system is specifically acquiring the SOC state of the energy storage device in the energy storage system, and dividing the SOC state of the energy storage device into three states of overdischarge protection, safe charge and discharge protection and overcharge protection. Optionally, the range corresponding to the over-discharge warning state is SOC <20%, the range corresponding to the safe charge and discharge state is SOC less than or equal to 20% and less than or equal to 90%, and the range corresponding to the over-charge warning state is SOC >90%.
In the embodiment of the invention, the energy storage life is greatly reduced due to the overcharge or overdischarge of the energy storage, namely, when the SOC of the energy storage system exceeds the charge-discharge critical constraint, the risk of greatly reducing the energy storage life exists. Therefore, the change speed and the change degree of the system frequency are comprehensively considered, and a targeted subsynchronous resonance suppression strategy is determined based on different energy storage system SOC ranges, so that the stability of the novel power system with the double-high characteristic is improved comprehensively.
S203, when the energy storage system SOC is in the first range, adjusting damping compensation parameters based on the inertia constant and the damping coefficient, and adjusting the system inertia coefficient based on the system frequency.
In the embodiment of the invention, the state of the energy storage system SOC in the first range means that the energy storage device is in a safe charge and discharge state, and optionally, the first range is 20% < SOC <90%, the inertia constant and the inertia coefficient are adjusted to obtain the resistance ratio compensation parameter, the damping compensation parameter comprises a proportional coefficient and a differential coefficient, and the system frequency is adjusted to obtain the system inertia coefficient.
In one possible implementation, the proportional and differential coefficient expressions in the damping compensation parameters are:
wherein K is pp The proportion coefficient of the damping compensation link is used; k (K) PD The differential coefficient of the damping compensation link; d is a damping coefficient; m=jω, M being the inertial torque; omega is the angular velocity of the system; j is a system inertia coefficient; k (k) 1 And k 2 For adjusting the coefficients; x is X g ＝ωL g ，X g Line side inductance, namely line inductance from the LC filter outlet to the PCC point; u (U) n The voltage amplitude value is the alternating current side voltage amplitude value of the inverter; u (U) g The amplitude of the alternating voltage is PCC; l (L) c ＝L g +L o ，L c Second order coefficients for transfer functions; l (L) g The equivalent inductance of the circuit; l (L) o ＝(1-H)/K v1 ，L o An open loop gain that is an inner loop transfer function, the magnitude of which represents the magnitude of the output impedance; k (K) v1 The integral coefficient of the voltage controller PI; r is R g Is the equivalent resistance of the circuit; p (P) n ＝X g U n U g ，P n Is a molecular term of the transfer function of the system.
Referring to FIG. 3, a block diagram of a damping compensation link control structure provided by an embodiment of the present invention is shown, U o For the voltage and current at the LC outlet of the inverter (corresponding to U n )，I o Is the current at the LC outlet of the inverter (I n )，P ref Rated for the inverter active power (equivalent to P in )，P e For inverter output power (equivalent to P out ) θ is the output phase angle; u (U) * For the system voltage reference value (corresponding to U g )，D-axis voltage reference value output by the controller, < > >For the q-axis voltage reference value, K, output by the controller pp For the proportional coefficient of the damping compensation link, K PD The differential coefficient of the damping compensation link is D is the damping coefficient, M is the rotation moment and X g U is the side inductance of the circuit n The voltage amplitude value is the alternating current side voltage amplitude value of the inverter; u (U) g For PCC AC voltage amplitude, R g And s is the Laplacian operator and is the equivalent resistance of the line.
In one possible implementation, the system inertia coefficient is expressed as follows, taking into account the system frequency variation:
wherein J is 0 The inertia is the inertia when the system operates normally; k (k) 5 And k 6 For adjusting the coefficients; Δk x Step length is adjusted for the parameters; beta is the system frequency fluctuation threshold; f is the system frequency; t is time; a is an exponential function coefficient.
In the embodiment of the invention, the system inertia J can be quickly adjusted according to the change degree of the system frequency, namely when the system frequency exceeds a limited maximum fluctuation value, J can be quickly increased along with the increase of the exponent of the power function, the inertia is increased by increasing the adaptive exponent, and the inertia level of the system is improved by providing support for the system frequency.
The exponential function coefficient A in the system inertia coefficient is determined by the system frequency variation degree difference value:
wherein f m Is rated frequency; f is the real-time frequency; Δf defines a maximum fluctuation value for the system frequency.
In the embodiment of the invention, the system frequency change condition is considered, on one hand, an exponential function taking the system frequency change rate as a core is established, and the system is provided with larger inertia when the frequency change rate is large and smaller inertia when the frequency change rate is small by combining the adjustment coefficient; on the other hand, the exponential function coefficient determined by the difference value between the real-time frequency and the rated frequency is combined with the adjustment step length, when the change value of the system frequency exceeds the set value, inertia is increased in a self-adaptive index manner, support is provided for the system frequency, and the running stability of the double-high power grid is improved.
S204, when the energy storage system SOC is not in the first range, adjusting the system inertia coefficient based on the energy storage system SOC.
In the embodiment of the invention, when the SOC of the energy storage system is not in the first range, if the SOC is smaller than the lower limit value of the first range, the energy storage device is in an overdischarge warning state, if the SOC is larger than the upper limit value of the first range, the energy storage device is in an overcharge warning state, and optionally, the range corresponding to the overdischarge warning state is SOC <20%, the range corresponding to the overcharge warning state is SOC >90%, and the service life of the energy storage device is greatly lost when the energy storage device is continuously discharged or charged in the two states, so that the inertia support of the energy storage system, namely the inertia coefficient of the system, is adjusted according to the SOC of the energy storage system.
In one possible implementation, when the energy storage system SOC is less than the first range lower limit, the system inertia coefficient is:
J＝k 3 SOC B J 0
wherein k is 3 B is an adjustment coefficient when the SOC of the energy storage system is smaller than the lower limit value of the first range; j (J) 0 The inertia is the inertia when the system is operating normally.
In one possible implementation, when the energy storage system SOC is greater than the first range upper limit, the system inertia coefficient is:
J＝k 4 (1-SOC) C J 0
wherein k is 4 And CThe adjustment coefficient is the adjustment coefficient when the SOC of the energy storage system is larger than the upper limit value of the first range; j (J) 0 The inertia is the inertia when the system is operating normally.
In this embodiment, a second-order transfer function G(s) controlled by the system VSG and an improved system transfer function G'(s) after adding a damping link are obtained, the system transfer function includes damping compensation parameters, different control strategies are provided by comprehensively considering the system frequency and the energy storage system SOC, when the energy storage system SOC is in a first range, the damping compensation parameters are adjusted based on inertia constants and damping coefficients, and when the energy storage system SOC is not in the first range, the system inertia coefficients are adjusted based on the energy storage system SOC, inertia support is provided for the system frequency, and the running stability of the "double-high" power grid is improved.
In a specific embodiment, the first range of SOC of the energy storage system is 20% < SOC <90%, the lower limit of the first range is 20%, the upper limit of the first range is 90%, and the system inertia coefficient expression is as follows:
wherein k is 3 And B is an adjustment coefficient when the SOC of the energy storage system is less than 20%; k (k) 4 And C is an adjustment coefficient when the SOC of the energy storage system is more than 90%; k (k) 5 And k 6 The adjustment coefficient is the adjustment coefficient when the SOC of the energy storage system is in the range of 20 percent to 90 percent; j (J) 0 The inertia is the inertia when the system is operating normally.
Referring to fig. 4, a model topology diagram of a distributed power generation-energy storage system with simulation verification provided by the embodiment of the invention is shown, as shown in fig. 4, a four-terminal alternating current optical storage micro-grid system mainly comprises an optical storage unit, a synchronous generator G1 and a load, and the whole topology structure is shown in fig. 4. The photovoltaic power generation device and the energy storage device are respectively converged to a direct current bus through a DC/DC converter and then are combined into the system through the DC/AC inverter, the synchronous generator G1 works in a constant power model to maintain the basic power supply requirement of a load, and the load side is a constant power load.
Referring to fig. 5, a comparison of bode diagrams before and after adding damping compensation in conventional VSG control provided by the embodiment of the present invention is shown, as shown in fig. 5, which shows a change situation of amplitude and phase of a system with a system frequency before and after adding damping compensation in conventional VSG control, it can be seen that before adding damping compensation in conventional VSG control, a resonance peak and a subsynchronous resonance phenomenon exist in the system, and after adding a damping compensation link, the amplitude of the resonance peak and the subsynchronous oscillation phenomenon of the system are suppressed.
The subsynchronous resonance suppression method of the invention is specifically described in an embodiment, and in the embodiment of the invention, a damping compensation strategy and a parameter self-adaptive control method are specifically described by taking the fact that photovoltaic energy storage equipment is connected into a power distribution network as a simulation object.
In the example, the frequency change condition of an alternating current bus of a system access load when the energy storage element is in a normal SOC state is considered, and the actual effects of the traditional VSG control method and the damping compensation method provided herein are compared. In this example, the adjustment coefficients in the adaptive parameters are respectively: adjusting coefficient k 1 =2; adjusting coefficient k 2 =5; the parameter adjustment step length is delta k x =8; the system frequency fluctuation threshold is β=0.5; the system frequency defines a maximum fluctuation value of Δf=0.02; the proportion coefficient of the damping compensation link is K pp ＝3×10 -5 The method comprises the steps of carrying out a first treatment on the surface of the The differential coefficient of the damping compensation link is K PD ＝5×10 -5 . The simulation results are shown in fig. 5 and 6.
Referring to fig. 6 and 7, fig. 6 shows a system frequency variation situation when conventional VSG control is adopted, and fig. 7 shows a system frequency variation situation after adaptive damping compensation is adopted.
In the embodiment of the invention, as can be seen from the comparison between fig. 6 and fig. 7, the method provided by the invention effectively improves the system damping when the system load changes, and inhibits the frequency oscillation phenomenon of the system, so that the new steady-state frequency value of the system is closer to the rated frequency, and the change degree is smaller.
It should be understood that, the sequence numbers of the steps in the above embodiments do not mean the order of execution, and the execution order of the processes should be determined by the functions and the internal logic, and should not limit the implementation process of the embodiments of the present invention.
The following are device embodiments of the invention, for details not described therein, reference may be made to the method embodiments of the above-mentioned countermeasures.
Fig. 8 is a schematic structural diagram of a secondary synchronization resonance suppression device according to an embodiment of the present invention, and for convenience of explanation, only a portion related to the embodiment of the present invention is shown, where the secondary synchronization resonance suppression device shown in fig. 8 includes: a first acquisition module 801, a second acquisition module 802, and an adjustment module 803.
The first obtaining module 801 is configured to obtain a second-order transfer function G(s) of the VSG control of the system and an improved system transfer function G'(s) after adding a damping link; wherein the system transfer function includes damping compensation parameters.
The second acquisition module 802 is configured to acquire a system frequency and an energy storage system SOC.
When the energy storage system SOC is within the first range, the adjustment module 803 is configured to adjust a damping compensation parameter based on the inertia constant and the damping coefficient, and adjust a system inertia coefficient based on the system frequency; the adjustment module 803 is configured to adjust the system inertia coefficient based on the energy storage system SOC when the energy storage system SOC is not within the first range.
In one possible implementation manner, the first obtaining module 801 is specifically configured to: the system transfer function includes damping compensation parameters; the damping compensation parameters comprise a proportional coefficient and a differential coefficient; the improved system transfer function G'(s) is:
wherein K is pp The proportion coefficient of the damping compensation link is used; k (K) PD For damping compensationCompensating differential coefficients of links; x is X g ＝ωL g ，X g Line side inductance, namely line inductance from the LC filter outlet to the PCC point; omega is the angular velocity of the system; u (U) n The voltage amplitude value is the alternating current side voltage amplitude value of the inverter; u (U) g The amplitude of the alternating voltage is PCC; l (L) c ＝L g +L o ，L c Second order coefficients for transfer functions; l (L) g The equivalent inductance of the circuit; l (L) o ＝(1-J)/K v1 ，L o An open loop gain that is an inner loop transfer function, the magnitude of which represents the magnitude of the output impedance; k (K) v1 The integral coefficient of the voltage controller PI; j is a system inertia coefficient; r is R g Is the equivalent resistance of the circuit; s is the Laplace operator.
In one possible implementation manner, the first obtaining module 801 is specifically configured to: adjusting damping compensation parameters based on the inertia constant and the damping coefficient, comprising:
adjusting a proportional coefficient and a differential coefficient based on the inertia constant and the damping coefficient;
wherein, the expression of the proportional coefficient and the differential coefficient is:
wherein K is pp The proportion coefficient of the damping compensation link is used; k (K) PD The differential coefficient of the damping compensation link; d is a damping coefficient; m=jω, M being the inertial torque; omega is the angular velocity of the system; j is a system inertia coefficient; k (k) 1 And k 2 For adjusting the coefficients; x is X g ＝ωL g ，X g Line side inductance, namely line inductance from the LC filter outlet to the PCC point; u (U) n The voltage amplitude value is the alternating current side voltage amplitude value of the inverter; u (U) g The amplitude of the alternating voltage is PCC; l (L) c ＝L g +L o ，L c Second order coefficients for transfer functions; l (L) g The equivalent inductance of the circuit; l (L) o ＝(1-H)/K v1 ，L o An open loop gain that is an inner loop transfer function, the magnitude of which represents the magnitude of the output impedance; k (K) v1 The integral coefficient of the voltage controller PI; r is R g Is the equivalent resistance of the circuit;P n ＝X g U n U g ，P n is a molecular term of the transfer function of the system.
In one possible implementation manner, the first obtaining module 801 is specifically configured to: the expression of the second order transfer function G(s) is:
wherein X is g ＝ωL g ，X g Line side inductance, namely line inductance from the LC filter outlet to the PCC point; omega is the angular velocity of the system; u (U) n The voltage amplitude value is the alternating current side voltage amplitude value of the inverter; u (U) g The amplitude of the alternating voltage is PCC; l (L) c ＝L g +L o ，L c Second order coefficients for transfer functions; l (L) g The equivalent inductance of the circuit; l (L) o ＝(1-H)/K v1 ，L o An open loop gain that is an inner loop transfer function, the magnitude of which represents the magnitude of the output impedance; k (K) v1 The integral coefficient of the voltage controller PI; r is R g Is the equivalent resistance of the circuit; s is the Laplace operator.
In one possible implementation, the adjusting module 803 is specifically configured to: when the energy storage system SOC is in the first range, the expression of the system inertia coefficient is:
wherein J is 0 The inertia is the inertia when the system operates normally; k (k) 5 And k 6 For adjusting the coefficients; Δk x Step length is adjusted for the parameters; beta is the system frequency fluctuation threshold; f is the system frequency; t is time; a is an exponential function coefficient.
Adjusting a system inertia coefficient based on a system frequency, comprising: and adjusting an exponential function coefficient A in the system inertia coefficient based on the system frequency, wherein the expression is as follows:
Wherein f m Is rated frequency; f is the real-time frequency; Δf defines a maximum fluctuation value for the system frequency.
In one possible implementation, the adjusting module 803 is specifically configured to: adjusting a system inertia coefficient based on the energy storage system SOC, comprising:
when the SOC of the energy storage system is smaller than the lower limit value of the first range, the inertia coefficient of the system is as follows:
J＝k 3 SOC B J 0
wherein k is 3 B is an adjustment coefficient when the SOC of the energy storage system is smaller than the lower limit value of the first range; j (J) 0 The inertia is the inertia when the system is operating normally.
In one possible implementation, the adjusting module 803 is specifically configured to: adjusting a system inertia coefficient based on the energy storage system SOC, comprising:
when the SOC of the energy storage system is greater than the upper limit value of the first range, the inertia coefficient of the system is as follows:
J＝k 4 (1-SOC) C J 0
wherein k is 4 And C is an adjustment coefficient when the SOC of the energy storage system is greater than the upper limit value of the first range; j (J) 0 The inertia is the inertia when the system is operating normally.
As can be seen from the above, the subsynchronous resonance suppression method provided by the embodiment of the present invention firstly obtains the second-order transfer function G(s) controlled by the system VSG and the improved system transfer function G'(s) after the damping link is added, where the system transfer function includes the damping compensation parameter; then acquiring system frequency and an energy storage system SOC; when the energy storage system SOC is in a first range, adjusting damping compensation parameters based on an inertia constant and a damping coefficient, and adjusting a system inertia coefficient based on a system frequency; and when the energy storage system SOC is not in the first range, adjusting the system inertia coefficient based on the energy storage system SOC. The embodiment comprehensively considers the system frequency and the SOC of the energy storage system, inhibits the subsynchronous resonance phenomenon of the system, and improves the running stability of the double-high power grid.
Referring to fig. 9, a schematic diagram of an electronic device according to an embodiment of the present invention is shown. As shown in fig. 9, the electronic apparatus 9 of this embodiment includes: a processor 90, a memory 91 and a computer program 92 stored in said memory 91 and executable on said processor 90. The steps of the embodiments of the subsynchronous resonance suppression method described above, such as steps S201 through S204 shown in fig. 2, are implemented when the processor 90 executes the computer program 92. Alternatively, the processor 90, when executing the computer program 92, performs the functions of the modules/units in the above-described device embodiments, for example, the functions of the modules 801 to 803 shown in fig. 8.
Illustratively, the computer program 92 may be partitioned into one or more modules/units that are stored in the memory 91 and executed by the processor 90 to complete the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing the specified functions, which instruction segments are used to describe the execution of the computer program 92 in the electronic device 9. For example, the computer program 92 may be split into modules 801 to 803 shown in fig. 8.
The electronic device 9 may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The electronic device 9 may include, but is not limited to, a processor 90, a memory 91. It will be appreciated by those skilled in the art that fig. 9 is merely an example of the electronic device 9 and is not meant to be limiting as the electronic device 9 may include more or fewer components than shown, or may combine certain components, or different components, e.g., the electronic device may further include an input-output device, a network access device, a bus, etc.
The processor 90 may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field-programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 91 may be an internal storage unit of the electronic device 9, such as a hard disk or a memory of the electronic device 9. The memory 91 may also be an external storage device of the electronic device 9, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the electronic device 9. Further, the memory 91 may also include both an internal storage unit and an external storage device of the electronic device 9. The memory 91 is used for storing the computer program and other programs and data required by the electronic device. The memory 91 may also be used for temporarily storing data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/electronic device and method may be implemented in other manners. For example, the apparatus/electronic device embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical function division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by instructing related hardware by a computer program, where the computer program may be stored in a computer readable storage medium, and the computer program may implement the steps of each of the embodiments of the subsynchronous resonance suppression method when executed by a processor. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium may include content that is subject to appropriate increases and decreases as required by jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is not included as electrical carrier signals and telecommunication signals.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (10)
1. A method of subsynchronous resonance suppression, comprising:
acquiring a second-order transfer function G(s) controlled by a system virtual synchronous generator VSG and an improved system transfer function G'(s) after a damping link is added; wherein the system transfer function includes a damping compensation parameter;
acquiring system frequency and state of charge (SOC) of an energy storage system;
when the energy storage system SOC is in a first range, adjusting the damping compensation parameter based on an inertia constant and a damping coefficient, and adjusting a system inertia coefficient based on a system frequency;
and when the energy storage system SOC is not in the first range, adjusting the system inertia coefficient based on the energy storage system SOC.
2. The method of subsynchronous resonance suppression according to claim 1, wherein said damping compensation parameters include a proportionality coefficient and a differential coefficient; the improved system transfer function G'(s) is:
wherein K is pp The proportion coefficient of the damping compensation link is used; k (K) PD The differential coefficient of the damping compensation link; x is X g ＝ωL g ，X g Is the line side inductance; omega is the angular velocity of the system; u (U) n The voltage amplitude value is the alternating current side voltage amplitude value of the inverter; u (U) g The amplitude of the alternating voltage is PCC; l (L) c ＝L g +L o ，L c Second order coefficients for transfer functions; l (L) g The equivalent inductance of the circuit; l (L) o ＝(1-J)/K v1 ，L o An open loop gain that is an inner loop transfer function, the magnitude of which represents the magnitude of the output impedance; k (K) v1 The integral coefficient of the voltage controller PI; j is a system inertia coefficient; r is R g Is the equivalent resistance of the circuit; s is the Laplace operator.
3. The method of subsynchronous resonance suppression according to claim 2, wherein said adjusting damping compensation parameters based on inertia constants and damping coefficients comprises:
adjusting a proportional coefficient and a differential coefficient based on the inertia constant and the damping coefficient;
wherein the expression of the proportional coefficient and the differential coefficient is:
wherein K is pp The proportion coefficient of the damping compensation link is used; k (K) PD The differential coefficient of the damping compensation link; d is a damping coefficient; m=jω, M being the inertial torque; omega is the angular velocity of the system; j is a system inertia coefficient; k (k) 1 And k 2 For adjusting the coefficients; x is X g ＝ωL g ，X g Line side inductance, namely line inductance from the LC filter outlet to the PCC point; u (U) n The voltage amplitude value is the alternating current side voltage amplitude value of the inverter; u (U) g The amplitude of the alternating voltage is PCC; l (L) c ＝L g +L o ，L c Second order coefficients for transfer functions; l (L) g The equivalent inductance of the circuit; l (L) o ＝(1-H)/K v1 ，L o An open loop gain that is an inner loop transfer function, the magnitude of which represents the magnitude of the output impedance; k (K) v1 The integral coefficient of the voltage controller PI; r is R g Is the equivalent resistance of the circuit; p (P) n ＝X g U n U g ，P n Is a molecular term of the transfer function of the system.
4. The method of claim 1, wherein when the energy storage system SOC is within a first range, the system inertia coefficient is expressed as:
wherein J is 0 The inertia is the inertia when the system operates normally; k (k) 5 And k 6 For adjusting the coefficients; Δk x Step length is adjusted for the parameters; beta is the system frequency fluctuation threshold; f is the system frequency; t is time; a is an exponential function coefficient;
the adjusting the system inertia coefficient based on the system frequency comprises the following steps: and adjusting an exponential function coefficient A in the system inertia coefficient based on the system frequency, wherein the expression is as follows:
wherein f m Is rated frequency; f is the real-time frequency; Δf defines a maximum fluctuation value for the system frequency.
5. The method of claim 1, wherein said adjusting the system inertia coefficient based on the energy storage system SOC comprises:
When the SOC of the energy storage system is less than the first range lower limit value, the system inertia coefficient is:
J＝k 3 SOC B J 0
wherein k is 3 B is an adjustment coefficient when the SOC of the energy storage system is smaller than the lower limit value of the first range; j (J) 0 The inertia is the inertia when the system is operating normally.
6. The method of claim 1, wherein said adjusting the system inertia coefficient based on the energy storage system SOC comprises:
when the energy storage system SOC is greater than the first range upper limit, the system inertia coefficient is:
J＝k 4 (1-SOC) C J 0
wherein k is 4 And C is an adjustment coefficient when the SOC of the energy storage system is greater than the upper limit value of the first range; j (J) 0 The inertia is the inertia when the system is operating normally.
7. The subsynchronous resonance suppression method according to claim 1, wherein the expression of the second order transfer function G(s) is:
wherein X is g ＝ωL g ，X g Line side inductance, namely line inductance from the LC filter outlet to the PCC point; omega is the angular velocity of the system; u (U) n The voltage amplitude value is the alternating current side voltage amplitude value of the inverter; u (U) g The amplitude of the alternating voltage is PCC; l (L) c ＝L g +L o ，L c Second order coefficients for transfer functions; l (L) g The equivalent inductance of the circuit; l (L) o ＝(1-H)/K v1 ，L o An open loop gain that is an inner loop transfer function, the magnitude of which represents the magnitude of the output impedance; k (K) v1 The integral coefficient of the voltage controller PI; r is R g Is the equivalent resistance of the circuit; s is the Laplace operator.
8. A subsynchronous resonance suppression device, comprising:
the first acquisition module is used for acquiring a second-order transfer function G(s) controlled by the system VSG and an improved system transfer function G'(s) after a damping link is added; wherein the system transfer function includes a damping compensation parameter;
the second acquisition module is used for acquiring the system frequency and the energy storage system SOC;
the adjusting module is used for adjusting the damping compensation parameter based on an inertia constant and a damping coefficient when the SOC of the energy storage system is in a first range and adjusting the inertia coefficient of the system based on the system frequency; the adjustment module is configured to adjust the system inertia coefficient based on the energy storage system SOC when the energy storage system SOC is not within a first range.
9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the subsynchronous resonance suppression method according to any one of the preceding claims 1 to 8 when the computer program is executed by the processor.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the subsynchronous resonance suppression method according to any one of the preceding claims 1 to 8.
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