Automatic quasi-synchronization device and synchronization verification blocking relay setting calculation method

Abstract

The invention discloses an automatic quasi-synchronization device and a synchronization verification blocking relay setting calculation method, and the setting calculation of the leading time, the switching-on and switching-off pulse width, the voltage difference, the frequency difference, the frequency modulation pulse width and the voltage regulation pulse width of the automatic quasi-synchronization device of a generator is carried out. And carrying out setting calculation on the maximum allowable phase angle difference, the voltage difference and the frequency difference of the synchronous verification blocking relay. By accurately calculating the setting parameters, coordination of the matching relation between the quasi-synchronization device and the synchronization verification blocking relay is ensured, the success rate and stability of generator parallel operation are improved, and the risk of power grid accidents is reduced. The method is suitable for the technical field of power system automation, and is especially suitable for parallel operation control of generators.

Description

Technical Field

[0001] The present invention relates to the field of power system automation, and in particular to an automatic quasi-synchronization device and a setting calculation method for a synchronization verification locking relay. Background Art

[0002] In power systems, parallel operation of generators is crucial for ensuring stable grid operation. However, existing methods for setting and calculating automatic generator synchronization devices and synchronization verification lockout relays have shortcomings, such as inaccurate setting parameters and inconsistent coordination. These issues result in a low success rate for parallel operation and may even cause grid accidents. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] The present invention proposes a generator automatic quasi-synchronizing device and a setting calculation method for a synchronization verification locking relay. By accurately calculating the setting parameters, the coordination relationship between the quasi-synchronizing device and the synchronization verification locking relay is ensured, thereby improving the success rate and stability of the parallel operation of the generators.

[0005] Another object of the present invention is to provide an automatic quasi-synchronization device for a generator and a setting calculation system for a synchronization verification locking relay.

[0006] To achieve the above-mentioned object, the present invention provides, on one hand, a generator automatic quasi-synchronization device and a setting calculation method for a synchronization verification locking relay, comprising:

[0007] Collect parameters of generators and related equipment and field test data to build a basic data set;

[0008] Performing a setting calculation of the quasi-synchronization device based on the basic data set to obtain a setting calculation result of the quasi-synchronization device;

[0009] A synchronous verification locking relay setting calculation is performed based on the basic data set to obtain a corresponding synchronous verification locking relay setting calculation result; wherein, the synchronous verification locking relay setting calculation includes a setting calculation of the maximum allowable phase angle difference of the synchronous verification locking relay, a setting calculation of the pressure difference of the synchronous verification locking relay, and a setting calculation of the frequency difference of the synchronous verification locking relay.

[0010] The automatic quasi-synchronization device for generators and the setting calculation method for synchronization verification locking relays according to the embodiments of the present invention may also have the following additional technical features:

[0011] In one embodiment of the present invention, performing a setting calculation of a quasi-synchronizing device based on the basic data set to obtain a setting calculation result of the quasi-synchronizing device includes:

[0012] Setting of the leading time of the quasi-synchronous device: The leading time of the quasi-synchronous device should be equal to the sum of the inherent closing time of the parallel circuit breaker and the operating time of the intermediate relay. The setting value of the leading time should be optimized based on the pseudo-synchronous test recording data;

[0013] Setting of the pulse width of the quasi-synchronous device when closing: Under the condition that the voltage difference, frequency difference and phase angle difference are within the allowable range, the pulse width of the quasi-synchronous device when closing is 1 to 2 times the lead time;

[0014] Setting of differential pressure △U of quasi-synchronous device: the setting value shall not exceed ±5% of rated voltage;

[0015] Setting of the frequency difference △f of the quasi-synchronous device: the setting value should be ±0.05Hz~±0.2Hz;

[0016] Setting of frequency modulation pulse width: the setting value shall not be less than 100ms, and the setting value shall be optimized according to the adjustment effect of field test;

[0017] Setting of voltage regulation pulse width: the setting value shall not be less than 100ms, and the setting value shall be optimized according to the adjustment effect of field tests.

[0018] In one embodiment of the present invention, the setting calculation of the maximum allowable phase angle difference of the synchronization check locking relay includes:

[0019] Calculate the setting value of the maximum allowable phase angle difference δ of the synchronous verification locking relay according to formula (1):

[0020]

[0021] Where U G is the voltage of the system to be connected; U S is the operating system voltage; I h.max Based on the closing allowable current multiple value in GB / T 50062; K S is the safety factor; X Σ —X d ”、X T 、X s The sum, X d ” is the direct-axis subtransient reactance of the synchronous generator, X T is the step-up variable reactance, X s is the system reactance, X d ”、X T 、X s All are per unit values based on generator capacity.

[0022] In one embodiment of the present invention, the setting calculation of the pressure difference of the synchronous verification locking relay includes:

[0023] Calculate the setting value of the pressure difference △U' of the synchronous verification locking relay according to formula (2):

[0024] △U'=K U △U(2)

[0025] Among them, K U K is the synchronous pressure differential locking coefficient, U =1.1~1.2, △U is the pressure difference setting value of the quasi-synchronous device.

[0026] In one embodiment of the present invention, the setting calculation of the frequency difference of the synchronous verification locking relay includes:

[0027] Calculate the setting value of the frequency difference △f' of the synchronous verification locking relay according to formula (3):

[0028] △f'=K f △f(3)

[0029] Among them, K f K is the synchronous frequency difference locking coefficient, f =1.1~1.2, △f is the frequency difference setting value of the quasi-synchronous device.

[0030] To achieve the above-mentioned object, the present invention further provides an automatic quasi-synchronization device and a synchronization verification locking relay setting calculation system, comprising:

[0031] Basic data acquisition module, used to collect parameters of generators and related equipment and field test measured data to build a basic data set;

[0032] A quasi-synchronizing device setting calculation module is used to perform a setting calculation of the quasi-synchronizing device based on the basic data set to obtain a quasi-synchronizing device setting calculation result;

[0033] The synchronous verification locking relay setting calculation module is used to perform synchronous verification locking relay setting calculation based on the basic data set to obtain the corresponding synchronous verification locking relay setting calculation result; wherein, the synchronous verification locking relay setting calculation includes the setting calculation of the maximum allowable phase angle difference of the synchronous verification locking relay, the setting calculation of the synchronous verification locking relay pressure difference and the setting calculation of the synchronous verification locking relay frequency difference.

[0034] The automatic quasi-synchronizing device and the synchronization verification locking relay setting calculation method and system of the embodiment of the present invention ensure the coordination between the quasi-synchronizing device and the synchronization verification locking relay by accurately calculating the setting parameters; improve the success rate and stability of the parallel operation of the generator; and reduce the risk of power grid accidents.

[0035] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0037] Figure 1 Flowchart of an automatic quasi-synchronizing device and a setting calculation method of a synchronization verification locking relay according to an embodiment of the present invention;

[0038] Figure 2 is a typical wiring diagram according to an embodiment of the present invention;

[0039] Figure 3 1. It is a structural diagram of an automatic quasi-synchronization device and a synchronization verification locking relay setting calculation system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0042] The following describes an automatic quasi-synchronization device and a setting calculation method and system for a synchronization verification locking relay according to an embodiment of the present invention with reference to the accompanying drawings.

[0043] Example 1:

[0044] Figure 1 1 is a flow chart of the automatic quasi-synchronization device and the setting calculation method of the synchronization verification locking relay according to an embodiment of the present invention. Figure 1 As shown, the method includes:

[0045] S1, collect the parameters of the generator and related equipment and the field test measured data to build the basic data set;

[0046] S2, performing a setting calculation of the quasi-synchronizing device based on the basic data set to obtain a setting calculation result of the quasi-synchronizing device;

[0047] S3, performing synchronous verification locking relay setting calculation based on the basic data set to obtain the corresponding synchronous verification locking relay setting calculation result; wherein, the synchronous verification locking relay setting calculation includes the setting calculation of the maximum allowable phase angle difference of the synchronous verification locking relay, the setting calculation of the synchronous verification locking relay pressure difference and the setting calculation of the synchronous verification locking relay frequency difference.

[0048] In one embodiment of the present invention, the parameters of the generator and related equipment are collected, including the rated voltage (such as 15.75kV), frequency (such as 50Hz), etc. The measured data of the field test are obtained, such as the inherent closing time of the parallel circuit breaker (such as 80ms), the action time of the intermediate relay (such as 6ms), etc. The basic parameters of the quasi-synchronous device and the synchronous verification locking relay are determined based on the collected parameters and measured data. Parameters such as the TV ratio are recorded, such as the ratio of TV1 and TV2 is 15.75 / 0.1kV, and the ratio of TV3, TV4, and TV5 is 500 / 0.1kV. A basic data set is formed, including generator parameters, circuit breaker parameters, TV ratio, etc., to provide input for subsequent setting calculations.

[0049] Furthermore, the quasi-synchronous device setting calculation is performed based on the basic data set, including:

[0050] Setting of the quasi-synchronous device leading time (t): The leading time of the quasi-synchronous device should be equal to the sum of the inherent closing time of the parallel circuit breaker and the operating time of the intermediate relay. Based on the pseudo-synchronous test recording data, the leading time setting value is optimized to ensure that the operating sequence of the quasi-synchronous device and the parallel circuit breaker matches.

[0051] Setting of the pulse width of the quasi-synchronous device when closing: While ensuring that the pressure difference, frequency difference and phase angle difference are within the allowable range, the pulse width of the quasi-synchronous device when closing should be 1 to 2 times the lead time.

[0052] Setting of differential pressure △U of quasi-synchronous device: the setting value should not exceed ±5% of rated voltage to ensure that the electrical parameters of parallel operation meet the requirements.

[0053] Setting of frequency difference △f of quasi-synchronous device: the setting value should be ±0.05Hz~±0.2Hz to improve the stability of parallel operation.

[0054] Setting of FM pulse width: The setting value should not be less than 100ms, and the setting value should be optimized based on the adjustment effect of field tests.

[0055] Adjustment of voltage regulation pulse width: The setting value should not be less than 100ms, and the setting value should be optimized according to the adjustment effect of field tests.

[0056] Furthermore, a synchronization check locking relay setting calculation is performed based on the basic data set, including:

[0057] In one embodiment of the present invention, the maximum allowable phase angle difference δ of the synchronization check lockout relay is calculated as follows: Considering the coordination relationship between the quasi-synchronizing device and the synchronization check lockout relay, the synchronization check lockout relay should first meet the opening condition. The setting value of the maximum allowable phase angle difference δ of the synchronization check lockout relay is calculated according to the following formula (1).

[0058]

[0059] Where: U G is the voltage of the system to be connected; U S is the operating system voltage; I h.max In accordance with the closing allowable current multiple value in GB / T 50062, the specific value can refer to the setting example in Appendix A; K S is the safety factor, ranging from 0.1 to 0.25. A smaller safety factor is recommended for large units. Σ —X d ”、X T 、X s The sum, X d ” is the direct-axis subtransient reactance of the synchronous generator, X T is the step-up variable reactance, X s is the system reactance, X d ”、X T 、X s All are per unit values based on generator capacity.

[0060] In one embodiment of the present invention, the setting calculation for the differential pressure ΔU' of the synchronous verification lockout relay is as follows: Considering the coordination relationship between the quasi-synchronizing device and the synchronous verification lockout relay, the synchronous verification lockout relay should first meet the opening condition. The setting value of the differential pressure ΔU' of the synchronous verification lockout relay is calculated according to the following formula (2).

[0061] △U'=K U △U(2)

[0062] Among them, K U K is the synchronous pressure differential locking coefficient, U =1.1~1.2, △U is the voltage differential setting value of the quasi-synchronous device. When using the circuit breaker on the high-voltage side of the transformer as a parallel circuit breaker, the voltage deviation effect of the TV ratio on both sides and the transformer operating ratio should be considered.

[0063] In one embodiment of the present invention, the frequency difference Δf' of the synchronization check interlock relay is calculated as follows: Considering the coordination between the quasi-synchronizing device and the synchronization check interlock relay, the synchronization check interlock relay should first meet the opening condition. The setting value of the frequency difference Δf' of the synchronization check interlock relay is calculated according to the following formula (3).

[0064] △f'=K f △f(3)

[0065] Among them, K f K is the synchronous frequency difference locking coefficient, f =1.1~1.2, △f is the frequency difference setting value of the quasi-synchronous device.

[0066] Example 2:

[0067] The setting calculation of the automatic quasi-synchronization device of the generator and the synchronization verification locking relay of the present invention is as follows:

[0068] A site wiring diagram is as follows Figure 2 As shown, the generators can be connected in parallel through circuit breaker 1, circuit breaker 2 or circuit breaker 3. The generator terminal voltage is 15.75kV, and the primary voltage is 525kV after being stepped up by the main transformer (YNd11). The TV transformation ratio of the generator outlet (TV1) and the main transformer low-voltage side (TV2) connected to the quasi-synchronous device is 15.75 / 0.1kV, and the TV transformation ratio of the system side (TV3, TV4, TV5) connected to the quasi-synchronous device is 500 / 0.1kV.

[0069] Related instructions:

[0070] 1) TV3, TV4, TV5 primary voltage: refers to the actual primary value of the voltage of the busbar to which TV3, TV4, TV5 are connected.

[0071] 2) TV1, TV2 primary voltage: refers to the actual primary value of the voltage of the busbar to which TV1 and TV2 are connected.

[0072] 3) The primary values of TV3, TV4, TV5, the secondary values of TV3, TV4, TV5, the primary values of TV1, TV2, and the secondary values of TV1, TV2 refer to the rated nameplate parameters of the on-site TV respectively.

[0073] 4) When circuit breaker 1 is used in parallel, select the synchronous voltage as TV1 and TV2 (if there is no TV2, select TV1 and TV3); when circuit breaker 2 is used in parallel, select the synchronous voltage as TV3 and TV4; when circuit breaker 3 is used in parallel, select the synchronous voltage as TV3 and TV5.

[0074] In this setting calculation example, the quasi-synchronous device has three synchronization points (circuit breaker 1, circuit breaker 2, or circuit breaker 3). Each synchronization point has a set of fixed values, for a total of three sets of fixed values. This document uses the setting calculation of the quasi-synchronous device of circuit breaker 1 and the synchronization verification locking relay as an example.

[0075] In this case, the setting calculations for the generator automatic quasi-synchronization device and the synchronization verification blocking relay are as follows:

[0076] 1. The setting calculation of the quasi-synchronous device is as follows:

[0077] 1.1 Setting of the leading time (t) of the quasi-synchronous device:

[0078] The leading time of the quasi-synchronous device should be equal to the sum of the inherent closing time of the parallel circuit breaker and the action time of the intermediate relay, and the leading time setting value should be optimized based on the pseudo-synchronous test recording data.

[0079] In this example, the inherent closing time of circuit breaker 1 is measured to be approximately 80ms, and the operating time of the intermediate relay is approximately 6ms.

[0080] Therefore, the leading time (t) of the quasi-synchronous device is set to 86ms.

[0081] 1.2 Setting of the pulse width of the quasi-synchronous device when closing the circuit breaker:

[0082] To ensure that the voltage difference, frequency difference, and phase angle difference are within a reliable range, the pulse width of the quasi-synchronous device's closing output should be 1 to 2 times the lead time. In this example, the pulse width of the quasi-synchronous device's closing output is set to 160ms.

[0083] 1.3 Setting of differential pressure △U of quasi-synchronous device:

[0084] The setting value should not exceed ±5% of the rated voltage. In this example, the differential voltage △U of the quasi-synchronous device is set to ±3V.

[0085] 1.4 Setting of frequency difference △f of quasi-synchronous device:

[0086] The setting value should be ±0.05Hz to ±0.2Hz. In this example, the frequency difference △f of the quasi-synchronous device is set to 0.12Hz.

[0087] 1.5 Setting of FM pulse width:

[0088] The setting value should not be less than 100ms, and should be optimized based on the adjustment results of field tests. In this example, the FM pulse width is set to 100ms.

[0089] 1.6 Setting of voltage regulation pulse width:

[0090] The setting value should not be less than 100ms, and should be optimized based on the adjustment effect of field tests. In this example, the voltage regulation pulse width is set to 100ms.

[0091] 1.7 Phase angle difference compensation setting:

[0092] When circuit breaker 1 is used in parallel, the synchronous voltages are selected as TV1 and TV2. At this time, there is no transformer connection group or TV connection phase difference, and the phase angle difference compensation is 0.

[0093] If TV2 is not available, TV1 and TV3 are selected. Due to the inherent phase angle difference caused by the transformer connection group or TV connection phase, secondary wiring adjustment or device setting should be used to compensate. Assume that TV1 and TV3 both use line voltage, the transformer has a YNd11 connection, and the TV1 voltage leads the TV3 voltage by 30°. This angle is the phase angle compensation value.

[0094] 1.8 Setting of synchronous voltage compensation on each side:

[0095] When circuit breaker 1 is connected in parallel, the synchronous voltages TV1 and TV2 are selected. At this time, there is no difference between the transformer ratio and the TV voltage ratio. The voltage setting on both sides can be adjusted according to the actual wiring method.

[0096] If TV2 is not available, select TV1 and TV3. Calculate and adjust the rated voltage or voltage adjustment factor for the system side and the side to be connected. Verify the correctness of the set value when increasing the voltage from zero with an empty busbar, and adjust the set value accordingly.

[0097] 2. Setting calculation of synchronous verification locking relay:

[0098] 2.1 Setting calculation of the maximum allowable phase angle difference of the synchronous verification locking relay:

[0099] The setting value of the maximum allowable phase angle difference δ of the synchronous verification locking relay should be calculated according to the following formula (A.1).

[0100]

[0101] In the formula, according to the requirements of standard GB / T 50062, taking the hydropower unit with a slightly lower allowable value as an example, the allowable value of the impulse current period component is 0.6 / X d ", the formula for calculating the periodic component of the closing current is I h.max =ΔU / (X q ”+X T +X s ). Generally, taking the unit connection unit as an example, its step-up transformer reactance X T The per-unit value is slightly smaller than the synchronous generator quadrature-axis subtransient reactance X q ”, X T Plus the system reactance X s It can be roughly considered as X q " are equal, so we have approximately I h.max =ΔU / (2X q ”); the permissible value for the inrush current is 0.6 / X q", then the allowable closing time ΔU is 1.2pu, considering the safety factor is 0.25 (you can also take a larger multiple of the safety factor, the resulting δ is smaller, which is more suitable for electronic synchronous verification locking relays. For mechanical synchronous verification locking relays, 0.25 is more practical), then the conservative closing time ΔU is 0.3pu, I h.max Take 1 / 4 of the closing allowable current multiple value in GB / T 50062, that is, 0.15 / X q ”.

[0102] From the above formula, we can get δ is about 16.8°. At the same time, to ensure the safety of the main equipment, the allowed phase angle difference δ should not be greater than 30°. In this example, the setting value of δ is 15°.

[0103] 2.2 Setting calculation of the pressure difference △U' of the synchronous verification locking relay:

[0104] △U'=K U △U (A.2)

[0105] Where K U Take 1.1 and set △U' to -3.3V.

[0106] 2.3 Setting calculation of frequency difference △f' of synchronous verification locking relay:

[0107] △f'=K f △f (A.3)

[0108] Where K f Take 1.1 and set △f' to 0.13Hz.

[0109] According to the automatic quasi-synchronizing device and synchronization verification interlocking relay setting calculation method of the present invention, the leading time, closing pulse width, voltage difference, frequency difference, and frequency and voltage modulation pulse width of the automatic quasi-synchronizing device of the generator are set, and the maximum allowable phase angle difference, voltage difference, and frequency difference of the synchronization verification interlocking relay are set. By accurately calculating the setting parameters, the coordination between the quasi-synchronizing device and the synchronization verification interlocking relay is ensured, the success rate and stability of parallel operation of generators are improved, and the risk of power grid accidents is reduced.

[0110] Example 3:

[0111] In order to implement the above embodiment, Figure 3 As shown, this embodiment also provides an automatic quasi-synchronization device and a synchronization verification locking relay setting calculation system 10, including:

[0112] Basic data acquisition module 100, used to collect parameters of generators and related equipment and field test measured data to construct a basic data set;

[0113] A quasi-synchronizing device setting calculation module 200 is configured to perform a setting calculation of the quasi-synchronizing device based on the basic data set to obtain a quasi-synchronizing device setting calculation result;

[0114] The synchronous verification locking relay setting calculation module 300 is used to perform synchronous verification locking relay setting calculation based on the basic data set to obtain the corresponding synchronous verification locking relay setting calculation result; wherein, the synchronous verification locking relay setting calculation includes the setting calculation of the maximum allowable phase angle difference of the synchronous verification locking relay, the setting calculation of the synchronous verification locking relay pressure difference and the setting calculation of the synchronous verification locking relay frequency difference.

[0115] Furthermore, the quasi-synchronizing device setting calculation module 200 is also used to:

[0116] Setting of the leading time of the quasi-synchronous device: The leading time of the quasi-synchronous device should be equal to the sum of the inherent closing time of the parallel circuit breaker and the operating time of the intermediate relay. The setting value of the leading time should be optimized based on the pseudo-synchronous test recording data;

[0117] Setting of the pulse width of the quasi-synchronous device when closing: Under the condition that the voltage difference, frequency difference and phase angle difference are within the allowable range, the pulse width of the quasi-synchronous device when closing is 1 to 2 times the lead time;

[0118] Setting of differential pressure △U of quasi-synchronous device: the setting value shall not exceed ±5% of rated voltage;

[0119] Setting of the frequency difference △f of the quasi-synchronous device: the setting value should be ±0.05Hz~±0.2Hz;

[0120] Setting of frequency modulation pulse width: the setting value shall not be less than 100ms, and the setting value shall be optimized according to the adjustment effect of field test;

[0121] Setting of voltage regulation pulse width: the setting value shall not be less than 100ms, and the setting value shall be optimized according to the adjustment effect of field tests.

[0122] Furthermore, the setting calculation of the maximum allowable phase angle difference of the synchronous verification locking relay includes:

[0123] Calculate the setting value of the maximum allowable phase angle difference δ of the synchronous verification locking relay according to formula (1):

[0124]

[0125] Where U G is the voltage of the system to be connected; U S is the operating system voltage; I h.max Based on the closing allowable current multiple value in GB / T 50062; K S is the safety factor; XΣ —X d ”、X T 、X s The sum, X d ” is the direct-axis subtransient reactance of the synchronous generator, X T is the step-up variable reactance, X s is the system reactance, X d ”、X T 、X s All are per unit values based on generator capacity.

[0126] Furthermore, the setting calculation of the pressure difference of the synchronous verification locking relay includes:

[0127] Calculate the setting value of the pressure difference △U' of the synchronous verification locking relay according to formula (2):

[0128] △U'=K U △U(2)

[0129] Among them, K U K is the synchronous pressure differential locking coefficient, U =1.1~1.2, △U is the pressure difference setting value of the quasi-synchronous device.

[0130] Furthermore, the setting calculation of the frequency difference of the synchronous verification locking relay includes:

[0131] Calculate the setting value of the frequency difference △f' of the synchronous verification locking relay according to formula (3):

[0132] △f'=K f △f(3)

[0133] Among them, K f K is the synchronous frequency difference locking coefficient, f =1.1~1.2, △f is the frequency difference setting value of the quasi-synchronous device.

[0134] According to the automatic quasi-synchronizing device and synchronization verification interlocking relay setting calculation system of the present invention, the leading time, closing pulse width, voltage difference, frequency difference, and frequency and voltage modulation pulse width of the automatic quasi-synchronizing device of the generator are set and calculated. Furthermore, the maximum allowable phase angle difference, voltage difference, and frequency difference of the synchronization verification interlocking relay are set and calculated. By accurately calculating the setting parameters, the coordination between the quasi-synchronizing device and the synchronization verification interlocking relay is ensured, improving the success rate and stability of parallel operation of generators and reducing the risk of power grid accidents.

[0135] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0136] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

Claims

1. An automatic quasi-synchronization device and a setting calculation method for a synchronization verification locking relay, characterized in that: include: Collect parameters of generators and related equipment and field test data to build a basic data set; Performing a setting calculation of the quasi-synchronization device based on the basic data set to obtain a setting calculation result of the quasi-synchronization device; A synchronous verification locking relay setting calculation is performed based on the basic data set to obtain a corresponding synchronous verification locking relay setting calculation result; wherein, the synchronous verification locking relay setting calculation includes a setting calculation of the maximum allowable phase angle difference of the synchronous verification locking relay, a setting calculation of the pressure difference of the synchronous verification locking relay, and a setting calculation of the frequency difference of the synchronous verification locking relay.

2. The method according to claim 1, characterized in that The quasi-synchronization device setting calculation is performed based on the basic data set to obtain the quasi-synchronization device setting calculation result, including: Setting of the leading time of the quasi-synchronous device: The leading time of the quasi-synchronous device should be equal to the sum of the inherent closing time of the parallel circuit breaker and the operating time of the intermediate relay. The setting value of the leading time should be optimized based on the pseudo-synchronous test recording data; Setting of the pulse width of the quasi-synchronous device when closing: Under the condition that the voltage difference, frequency difference and phase angle difference are within the allowable range, the pulse width of the quasi-synchronous device when closing is 1 to 2 times the lead time; Setting of differential pressure △U of quasi-synchronous device: the setting value shall not exceed ±5% of rated voltage; Setting of the frequency difference △f of the quasi-synchronous device: the setting value should be ±0.05Hz~±0.2Hz; Setting of frequency modulation pulse width: the setting value shall not be less than 100ms, and the setting value shall be optimized according to the adjustment effect of field test; Setting of voltage regulation pulse width: the setting value shall not be less than 100ms, and the setting value shall be optimized according to the adjustment effect of field tests.

3. The method according to claim 1, characterized in that The setting calculation of the maximum allowable phase angle difference of the synchronous verification locking relay includes: Calculate the setting value of the maximum allowable phase angle difference δ of the synchronous verification locking relay according to formula (1): Where U G is the voltage of the system to be connected; U S is the operating system voltage; I h.max Based on the closing allowable current multiple value in GB / T 50062; K S is the safety factor; X Σ —X d ”、X T 、X s The sum, X d ” is the direct-axis subtransient reactance of the synchronous generator, X T is the step-up variable reactance, X s is the system reactance, X d ”、X T 、X s All are per unit values based on generator capacity.

4. The method according to claim 1, wherein The setting calculation of the differential pressure of the synchronous verification locking relay includes: Calculate the setting value of the differential pressure △U' of the synchronous verification locking relay according to formula (2): △U’=K U △U (2) Among them, K U K is the synchronous pressure differential locking coefficient, U =1.1~1.2, △U is the pressure difference setting value of the quasi-synchronous device.

5. The method according to claim 1, wherein The setting calculation of the frequency difference of the synchronous verification locking relay includes: Calculate the setting value of the frequency difference △f' of the synchronous verification locking relay according to formula (3): △f’=K f △f(3) Among them, K f K is the synchronous frequency difference blocking coefficient, f =1.1~1.2, △f is the frequency difference setting value of the quasi-synchronous device.

6. A generator automatic quasi-synchronization device and synchronization verification locking relay setting calculation system, characterized in that: include: Basic data acquisition module, used to collect parameters of generators and related equipment and field test measured data to build a basic data set; A quasi-synchronizing device setting calculation module is used to perform a setting calculation of the quasi-synchronizing device based on the basic data set to obtain a quasi-synchronizing device setting calculation result; The synchronous verification locking relay setting calculation module is used to perform synchronous verification locking relay setting calculation based on the basic data set to obtain the corresponding synchronous verification locking relay setting calculation result; wherein, the synchronous verification locking relay setting calculation includes the setting calculation of the maximum allowable phase angle difference of the synchronous verification locking relay, the setting calculation of the synchronous verification locking relay pressure difference and the setting calculation of the synchronous verification locking relay frequency difference.

7. The system according to claim 6, characterized in that The quasi-synchronous device setting calculation module is also used for: Setting of the leading time of the quasi-synchronous device: The leading time of the quasi-synchronous device should be equal to the sum of the inherent closing time of the parallel circuit breaker and the operating time of the intermediate relay. The setting value of the leading time should be optimized based on the pseudo-synchronous test recording data; Setting of the pulse width of the quasi-synchronous device when closing: Under the condition that the voltage difference, frequency difference and phase angle difference are within the allowable range, the pulse width of the quasi-synchronous device when closing is 1 to 2 times the lead time; Setting of differential pressure △U of quasi-synchronous device: the setting value shall not exceed ±5% of rated voltage; Setting of the frequency difference △f of the quasi-synchronous device: the setting value should be ±0.05Hz~±0.2Hz; Setting of frequency modulation pulse width: the setting value shall not be less than 100ms, and the setting value shall be optimized according to the adjustment effect of field test; Setting of voltage regulation pulse width: the setting value shall not be less than 100ms, and the setting value shall be optimized according to the adjustment effect of field tests.

8. The system according to claim 6, wherein: The setting calculation of the maximum allowable phase angle difference of the synchronous verification locking relay includes: Calculate the setting value of the maximum allowable phase angle difference δ of the synchronous verification locking relay according to formula (1): Where U G is the voltage of the system to be connected; U S is the operating system voltage; I h.max Based on the closing allowable current multiple value in GB / T 50062; K S is the safety factor; X Σ —X d ”、X T 、X s The sum, X d ” is the direct-axis subtransient reactance of the synchronous generator, X T is the step-up variable reactance, X s is the system reactance, X d ”、X T 、X s All are per unit values based on generator capacity.

9. The system according to claim 6, wherein: The setting calculation of the differential pressure of the synchronous verification locking relay includes: Calculate the setting value of the differential pressure △U' of the synchronous verification locking relay according to formula (2): △U’=K U △U (2) Among them, K U K is the synchronous pressure differential locking coefficient, U =1.1~1.2, △U is the pressure difference setting value of the quasi-synchronous device.

10. The system according to claim 6, wherein: The setting calculation of the frequency difference of the synchronous verification locking relay includes: Calculate the setting value of the frequency difference △f' of the synchronous verification locking relay according to formula (3): △f’=K f △f(3) Among them, K f K is the synchronous frequency difference blocking coefficient, f =1.1~1.2, △f is the frequency difference setting value of the quasi-synchronous device.

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